Some simple optimzations, more comments and indentation changes.
Add ` around database in 'use database' in binary log.
Moved max_error_count and max_warning_count to variables struct.
Removed SHOW_WARNS_COUNT and SHOW_ERRORS_COUNT calls.
Changed string functions to use character set of first string argument as default return characterset
(Each string function can change the above assumption if needed)
Fixed configure problems with HPUX and openbsd
SHOW SLAVE STATUS returns empty set if slave is not initialized
SHOW MASTER STATUS returns empty set if binary logging is not enabled.
Fixed shutdown problem on Solaris.
