Unhandled PDO exceptions

[stwalkerster]

This was triggered when I had a long-running (read: 6 minutes) transaction in the database (probably locking both comment and log tables), and comments were being added to a request.

SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction

#0 ./includes/DataObjects/Comment.php(109): PDOStatement->execute()
#1 ./includes/Pages/RequestAction/PageComment.php(65): Waca\DataObjects\Comment->save()
#2 ./includes/Tasks/PageBase.php(107): Waca\Pages\RequestAction\PageComment->main()
#3 ./includes/Tasks/InternalPageBase.php(90): Waca\Tasks\PageBase->runPage()
#4 ./includes/WebStart.php(183): Waca\Tasks\InternalPageBase->execute()
#5 ./includes/WebStart.php(104): Waca\WebStart->main()
#6 ./internal.php(24): Waca\WebStart->run()
#7 {main}

There's probably a ton of places in the tool where this can be triggered, so we probably ought to have a more generic handler for this than the global exception handler.