client/mysqldump.c:
  Add description of quote_for_like
  Add quoting of \ to \\\\ in quote_for_like
  Add DBUG_*
  Rearranged code in dump_selected_tables so the first thing it will do is to check that the tables to dump are available
  Unless --force is used, program will exit if not all specified tables can be found
  Add files to dump to HASH table for easy iteration
  Simpler handling of ignore_table list.
  Add new error code used when table user selected to dump  can not be found in db
client/mysqltest.c:
  Make it possible to exec a command that fails by setting --error <errno> before the command to exec.
  Check that the error returned from executed program matches the expected error.
  Add DBUG_* printouts
mysql-test/mysql-test-run.sh:
  export MYSQL_DUMP_DIR used in "--replace_result"
mysql-test/r/mysqldump.result:
  Added test for illegal / nonexisting table and database names
mysql-test/t/mysqldump.test:
  Added test for illegal / nonexisting table and database names