Fixed bug in ISAM and MyISAM when updating from multiple-processes


Docs/manual.texi:
  Updated changelog
client/mysqladmin.c:
  Upgraded version number because the change of llstr() is visible
extra/perror.c:
  Added new error message
include/my_base.h:
  Added HA_ERR_CRASHED_ON_USAGE
isam/rnext.c:
  Fixed bug when updating from multiple-processes
isam/rprev.c:
  Fixed bug when updating from multiple-processes
libmysql/libmysql.c:
  Fixed that mysql->options.client_flag was used properly
myisam/mi_locking.c:
  Fixed bug when updating from multiple-processes
myisam/mi_open.c:
  Fixed bug when updating from multiple-processes
  Added HA_ERR_CRASHED_ON_USAGE
myisam/mi_rnext.c:
  Fixed bug when updating from multiple-processes
myisam/mi_rprev.c:
  Fixed bug when updating from multiple-processes
myisam/myisamchk.c:
  Added HA_ERR_CRASHED_ON_USAGE
sql/sql_base.cc:
  Fixed problem with auto-repair of MyISAM tables
sql/table.cc:
  Fixed problem with auto-repair of MyISAM tables