modifications, finished and tested**********************************- adapted EDCF model to ns-2.28- cleaned slot boundary computation - updated EDCA to approved draft version 13.0:	- increment of retry counter in case of internal collisions	- new backoff decrement according to 11e draft v13.0to be tested*****************- RTS/CTS mechanismTBD***- block ACK / no ACK mechanismminor changes*************- release 1-0-1 now includes the Default EDCA Parameter Set for   802.11b PHYs according to draft version 13- release 1-0-2 (08/22/06)        - model version used for technical report TKN-TR 06-003	- removed small tracing error; now collisions of data frames          are shown properly in ns2 trace.