Added preliminary handling of symlinks in MyISAM.
When using myisamchk to check tables with --force, don't repair
tables that are marked as 'not closed' if they are ok.
Change fn_format() to use my_real_path and my_symlink


include/myisam.h:
  Added handling of symlinks
myisam/ft_boolean_search.c:
  cleanup
myisam/ft_dump.c:
  cleanup
myisam/mi_check.c:
  Added handling of symlinks.
  When using check and --force, don't repair tables that are marked
  as 'not closed' if they are ok.
myisam/mi_create.c:
  Added handling of symlinks.
myisam/mi_dbug.c:
  Added handling of symlinks.
myisam/mi_info.c:
  Added handling of symlinks.
myisam/mi_open.c:
  Added handling of symlinks.
myisam/mi_search.c:
  cleanup
myisam/myisamchk.c:
  Added handling of symlinks.
myisam/myisamdef.h:
  Added handling of symlinks.
myisam/myisamlog.c:
  Fixed bug when using new trees
myisam/myisampack.c:
  cleanup
mysys/mf_cache.c:
  cleanup
mysys/mf_format.c:
  Change to use my_real_path and my_symlink
mysys/my_alloc.c:
  cleanup
BitKeeper/etc/ignore:
  Added libmysqld/sql_command libmysqld/backup_dir libmysqld/simple-test to the ignore list
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted