Added some fields to the st_my_thread_var structure to be
  able to link such structures into a list.


include/my_pthread.h:
  Added some fields to the st_my_thread_var structure to be
  able to link such structures into a list.
mysys/mf_keycache.c:
  Introduced a scalable key cache management.
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted