- Make mysql-test-run.pl restart a crashed/stopped process if it was expected it should crash.
 - Added testcase for "crash_commit_before", which tests behaviour when server crashes just before commit.
  * The testcase first write a small var/tmp/master0.expect file indicating expected crash
  * Then sets "DEBUG" variable to for example "d,crash_commit_before" and then executes a commit.
  * The server will crash and be brought back up by mysql-test-run.pl
  * Test case will then wait for the process to come back online before continuing.


client/mysqltest.c:
  Add "die" command used to abort a failing test case
  Remove unused "exit" command
mysql-test/lib/mtr_process.pl:
  When a process crash during execution of mysqltest, check if it was expected and restart the process in that case.
mysql-test/mysql-test-run.pl:
  Remmeber options used when ndbd's and mysqld's was started, to be used by restart code
mysql-test/r/crash_commit_before.result:
  New BitKeeper file ``mysql-test/r/crash_commit_before.result''
mysql-test/include/wait_until_connected_again.inc:
  New BitKeeper file ``mysql-test/include/wait_until_connected_again.inc''
mysql-test/t/crash_commit_before.test:
  New BitKeeper file ``mysql-test/t/crash_commit_before.test''