Added PURGE BINARY LOGS as synonym for PURGE MASTER LOGS.
Removed PURGE LOGS (now PURGE MASTER LOGS).
Added SHOW BDB LOGS as synonym for SHOW LOGS.
Note: tests key_cache.test hanged, rpl_log_pos.test, rpl_rotate_logs.test failed for me.
For the second and third one I guess this will disappear after merging 4.0.