Support option lines longer than 256 chars.
Close the slow log at shutdown.
Always allow debug options to mysqld.
Change some DBUG_PRINT tags.


Docs/manual.texi:
  Small cleanups
configure.in:
  Force close of sockets on HPUX 10.20
mysql-test/t/merge.test:
  Remove used tables
mysys/default.c:
  Support option lines longer than 256 chars.
mysys/mf_keycache.c:
  Split check_keycache tags
sql/mysqld.cc:
  Move things to 'cleanup'.
  Close the slow log at shutdown.
  Always allow debug options
sql/violite.c:
  Change the error tag to vio_error