Don't log check_warnings to binlog


mysql-test/include/check-testcase.test:
  Change to use a stored pårocedure for check_testcase
mysql-test/include/mtr_warnings.sql:
  Don't log the check_warning procedure to binlog
mysql-test/mysql-test-run.pl:
  Turn on --check-testcase by default
mysql-test/include/mtr_check.sql:
  New BitKeeper file ``mysql-test/include/mtr_check.sql''