necessary implementation in the server
mysql_upgrade script added


client/mysqlcheck.c:
  --check-upgrade option added
include/my_base.h:
  errcode added
include/myisam.h:
  option added
scripts/Makefile.am:
  mysql_upgrade script added
sql/handler.cc:
  checks for old types/bugs added
sql/handler.h:
  declarations regarding checks for upgrade
sql/lex.h:
  sym added
sql/share/errmsg.txt:
  error message added
sql/slave.cc:
  now ha_repair is for public use
sql/sql_table.cc:
  upgrade in ha_repair implemented
sql/sql_yacc.yy:
  CHECK ... FOR UPGRADE added to syntax