Updated qsort source from glibc.
Add debugging of keycache when EXTRA_DEBUG is specified


Docs/manual.texi:
  Added new contrib stuff
bdb/dist/Makefile.in:
  Don't automaticly checkout things from bk
mysys/mf_keycache.c:
  Add debugging of keycache when EXTRA_DEBUG is specified.
mysys/mf_qsort.c:
  Updated qsort source from glibc.
sql/Makefile.am:
  Cleanup up stacktrace code
sql/mysqld.cc:
  Cleanup up stacktrace code