client/mysqltest.c:
  Added --big-test argument
libmysqld/lib_sql.cc:
  Reset error messages before new query.
libmysqld/lib_vio.c:
  Fixed reading of results.
mysql-test/mysql-test-run.sh:
  Added option --big
mysql-test/r/multi_update.result:
  More multi-delete tests
mysql-test/t/bdb-crash.test:
  Added missing test if BDB is supported
mysql-test/t/multi_update.test:
  More multi-delete tests