Aztec Version 2.0 Release Notes* We have added several new features:     1) ilut preconditioner    2) ilu(k), bilu(k), icc(k) for k > 0.    2) arbitrary overlap in domain decomposition    3) equation reordering for incomplete factorization       based on RCM algorithm    4) Matrix-free & user-supplied preconditioning interface    5) Improved flexability. Solvers can be used as       preconditioners. *****************  IMPORTANT for Aztec 1.1 USERS   *********************************  IMPORTANT for Aztec 1.1 USERS   *********************************  IMPORTANT for Aztec 1.1 USERS   ****************  The following changes must be made to use Aztec 2.0:     1) references to "params[AZ_fill]" need to be changed       to "params[AZ_ilut_fill]".    2) references such as "option[AZ_precond] = xxx;" where       xxx is AZ_ilu, AZ_ilut, AZ_bilu must be changed to           option[AZ_precond] = AZ_dom_decomp;          options[AZ_subdomain_solve] = xxx;    3) options[AZ_keep_info] must be set to '1' if previous       solver information is to be reused.    4) options[AZ_overlap] = AZ_none' corresponds to 'options[AZ_overlap] = 0'        and        options[AZ_overlap] = AZ_full' corresponds to 'options[AZ_overlap] = 1'          The keywords 'AZ_none' and 'AZ_full' are still recognized however       they may be phased out some day.       Finally, Aztec 2.0 may give a somewhat different   convergence history than Aztec 1.1. The main difference    between the two is that RCM reordering is now the default    when using incomplete factorizations.  If you don't want    this set                    options[AZ_reorder] = 0;********************************************************************************************************************************************************************************************************** Several new machines have been added to the Makefile  including: Cray T3E and Linux boxes.* A new matrix-free sample program has been included with the  distribution.    * We have fixed a bug in the MPI communication associated with   AZ_transform().* We have fixed a couple of memory bugs in the domain decomposition.* Other minor bug fixes.* IMPORTANT: a few Aztec function parameters have changed. Mostly  things like using unsigned integers instead of signed integers.  This may generate warnings on some compilers unless you explicitly  cast the parameters.* The User's Guide has been updated to reflect these changes.-------------------------------------------------------------------------------