A couple of small changes to ha_example (mainly comments). 


sql/examples/ha_archive.cc:
  Changes from Serg.
  A few styles changes, fix for potential hash insert gone wrong, removed bad tables if create fails, gzflush used for flushing by default (had problems with OSX 10.2), and some spelling corrections.
sql/examples/ha_archive.h:
  Removed fast_key_read() and changed the name of a conflicting variable.
sql/examples/ha_example.cc:
  Added a few new comments.
sql/examples/ha_example.h:
  Added pragma interface. Removed fast_key_read() and Serg's request