--- Release version 1.01 21.22.2003 -------------------------------------
Initial release

--- Release version 1.02 25.02.2003 -------------------------------------
1. Support value types
2. Add FieldIndex interface
3. Fix bug in unique index support

--- Release version 1.03 03.03.2003 -------------------------------------
1. Fix bug in LinkImpl constructor
2. Make it possible to call IPersistent.deallocate multiple times.

--- Release version 1.04 12.03.2003 -------------------------------------
1. Fix bug in rollback method
2. Add IPersistent.onLoad method
3. Fix bugs in BtreeFieldIndex
4. Add TestLink example

--- Release version 1.05 04.04.2003 -------------------------------------
1. Add optional garbage collection

--- Release version 1.06 09.04.2003 -------------------------------------
1. Add obejct level locking

--- Release version 1.07 18.04.2003 -------------------------------------
1. Add Persistent.modify method, allowing to mark object as dirty. 
Object will be automatically saved during transaction commit.
2. Add index iterator.
3. Add spatial index.


--- Release version 1.08 22.04.2003 -------------------------------------
1. Implement more sophisticated iterators for index search  
2. Fix bug in R-Tree
 
--- Release version 1.09 06.05.2003 -------------------------------------
1. Fix bug in packing array of strings. 

--- Release version 1.10 28.05.2003 -------------------------------------
1. Add Storage.isOpened() method
2. Change store() with modify() in Btree implementation

--- Release version 1.11 09.06.2003 -------------------------------------
1. Add methods for database import/export in XML format. 

--- Release version 1.12 18.06.2003 -------------------------------------
1. Fix bug in Btree (replacing existed values in scalar index)
2. Using CSharp serialization mechanism to store in database alien objects

--- Release version 1.13 04.07.2003 -------------------------------------
1. Make it possible to provide user specific implementation of PERST file interface. 
For example it can be used to work with flash card or encrypted files.

--- Release version 1.14 09.07.2003 -------------------------------------
1. Add Storage.getObjectByOID method
2. Add autoincremented field support: FieldIndex.append method

--- Release version 1.15 16.07.2003 -------------------------------------

1. Add Index.GetDicitionaryEnumerator() method which makes it possible to access both key and value.

--- Release version 1.16 23.07.2003 -------------------------------------

1. Fix bug in index iterator (iterating through empty index)

--- Release version 1.17 01.08.2003 -------------------------------------

1. Store weak references in modified object list to make it possible to GC to reclaim these objects
2. Support sets of persistent objects (Storage.createSet method)

--- Release version 1.18 19.09.2003 -------------------------------------

1. Add enumeration and indexation methods to Link interface. 

--- Release version 1.19 24.09.2003 -------------------------------------

1. Provide new implementation of modified object list. Old implementation introduced in 
version 1.17 and based on weak reference in finalize method in Persistent class
can cause loose of modifications if weak reference is cleared by GC, but finalize
method is not invoked before transaction commit.

--- Release version 1.20 02.10.2003 -------------------------------------

1. Add FieldIndex.contains method
2. Port to Visual Studio 2003
3. Support of Compact .Net framework
4. Conditional compilation of code supporting raw binary type
(System.Runtime.Serialization.Formatters.Binary.BinaryFormatter class in not supported in Compact.Net framework)
5. Replace '+' in C# identifiers during XML export

--- Release version 1.21 08.10.2003 -------------------------------------

1. Support of main-memory databases. 

--- Release version 1.22 17.10.2003 -------------------------------------

1. Add SortedCollection container class
2. Fix bugs in main-memory database support
3. Fix bug with lost modifications

--- Release version 2.01 23.10.2003 -------------------------------------

1. Automatic scheme evaluation support.
Attention: database format is incompatible with version 1.22!
2. New implementation of modified object list
3. Make it possible to tune most of database parameters using Storage.setProperty/Storage.setProperties methods


--- Release version 2.02 07.11.2003 -------------------------------------

1. Support indices for byte arrays
2. Support compound indices
3. Fix bug un unpacking arrays of enums.

--- Release version 2.03 19.11.2003 -------------------------------------

1. Add IPersistent.invalidate method. Transaction rollback will now invalidate all modified objects.
2. Support per-thread transactions (Storage.beginTransaction and Storage.endTranasction methods)
3. Yet another attempt to eliminate modification list and handle modified object using weak references.
4. Rename all public Perst methods according to C# naming convention.

--- Release version 2.04 26.11.2003 -------------------------------------
1. Derive ISet from IPersistent and IResource interfaces

--- Release version 2.05 28.11.2003 -------------------------------------

1. Make it possible to profile storage memory using Storage.getMemoryDump() method 

--- Release version 2.06 11.12.2003 -------------------------------------

1. Make it possible to index properties
2. Fix bug in packing char fields.
3. Support of decimal and Guid types

--- Release version 2.07 14.12.2003 -------------------------------------

1. Fix critical bug in object index relocation algorithm
2. Fix bug in recovery procedure

--- Release version 2.08 20.12.2003 -------------------------------------

1. Add Blob class

--- Release version 2.09 23.12.2003 -------------------------------------
1. Fix bug in Link.insert method
2. Add ClassLoader interface and Storage.Loader property

--- Release version 2.10 30.12.2003 -------------------------------------
1. Fix bug in XML import

--- Release version 2.11 07.01.2004 -------------------------------------
1. Add Storage.backup method which can be used for online backups and database compactification
2. Add support of time series
3. Fix bugs in unpacking arrays of values

--- Release version 2.12 12.01.2004 -------------------------------------
1. Dynamically generate packing/unpacking code for persistent objects. 
This feature works only for public classes with public members
and not having components of the following types: value, 
array of value, array of objects, arrays of enums.
Also it is not supported in Compact.NET version. 
Dynamic generation is automatically used when class meets described
above criteria.


--- Release version 2.13 24.01.2004 -------------------------------------
1. Fix bugs in dynamic packing/unpacking code generation algorithm
2. Support persistency for MarshalByRef objects (add MarshalByRefPersistent class)

--- Release version 2.14 30.01.2004 -------------------------------------
1. Fix bug in Guid pack method
2. Fix bug in object modification mechanism which can cause deadlock.
3. Make it possible to specify part of compound key in query

--- Release version 2.15 06.02.2004 -------------------------------------
1. Fix bugs with unpacking fields of byte, sbyte, ushort and uint types.

--- Release version 2.16 10.02.2004 -------------------------------------
1. Fix bug in Persistent.invalidate method

--- Release version 2.17 26.02.2004 -------------------------------------
1. Fix bug in code checking when pack/unpack method generation is possible
2. Add check for concurrent modifications in B-Tree iterator
3. Add Projection class
4. Add Index.getPrefix, Index.prefixIterator, FieldIndex.getPrefix and FieldIndex.prefixIterator methods
5. Fix bugs in RelationImpl class

--- Release version 2.18 07.03.2004 -------------------------------------
1. Add default comparer for SortedCollection class (expecting that members of collection 
   implement Comparable interface)
2. Fix bug in Index.Set method for non-unique indices
3. Support of database file encryption 

--- Release version 2.19 18.03.2004 -------------------------------------
1. Fix bug in file encyption
2. Optimize class lookup algorithm
3. Add perst.code.generation property which allows to enable or disable dynamic generation
of pack/unpack methods.
4. Generation of pack/unpack methods in background (by separate thread)

--- Release version 2.20 04.04.2004 -------------------------------------
1. Add Link.Pin and Link.Unpin methods. Do not implicitely pin accessed Link elements.
2. Change class descriptor loading algorithm to avoid stack overflow
   in applications with large number of classes
3. Detect bugs related with incorrect serialization of persistent object as raw or value type
4. Fix bug in automatic scheme evalaution implementation.

--- Release version 2.21 16.04.2004 -------------------------------------
1. Add Index.KeyType, FieldIndex.IndexedClass and FieldIndex.KeyFields properties
2. Add Index.PrefixSearch method which can be used to locate keys which are prefixes of the specified word.

--- Release version 2.22 10.04.2004 -------------------------------------
1. Fix bug in dbTimeSeries class
2. Implement reallocatable bitmap (now database size is not limited by dbDatabaseOffsetBits constant)

--- Release version 2.23 09.05.2004 -------------------------------------
1. Make StorageImpl.swizzle and StorageImpl.unswizzle method protected to be allow
their redefinition in derived class.
2. Fix problem with parsing ulong literals in XMLImport

--- Release version 2.24 17.05.2004 -------------------------------------
1. Index.Remove(Key), Index.Set(Key,IPersistent), FieldIndex.Remove(Key) and FieldIndex.Set(IPersistent)
methods now return reference to the removed/replaced object.

--- Release version 2.25 28.05.2004 -------------------------------------
1. Optimized version of T-Tree algorithm

--- Release version 2.26 07.06.2004 -------------------------------------
1. Fix bug in FieldIndex.remove(Key) introduced in version 2.24

--- Release version 2.27 15.06.2004 -------------------------------------
1. Add handling of Decimal and Guid types to Btree.getKeyFromObject() method 
2. Fix bug in XMLExporter.exportBinary
3. Change R-Tree and rectangle implementation to calculate rectangles area using long type

--- Release version 2.28 28.06.2004 -------------------------------------
1. Add PersistentContext and TransparentPersistenceAttrribute classes to provide
transparent persistence for C# objects using .Net remoting API. If application
class is derived from PersistentContext and marked with TransparentPersistence attribute, 
it will automatically load on demand its content from the database and automatically store
content if the object is modified. But remoting API can handle only public members of the class
and also cause significant performance overhead (invocation of method through remoting API
is about 100 times slower than normal method invocation)

--- Release version 2.29 05.07.2004 -------------------------------------
1. Make it possible to use Storage.Gc() for verification of consistency of database.
Now this method returns number of deallocated (garbage objects) and detects dangling references in