Copy language constants from manager\includes\lang\errormsg\*.inc.php to manager\includes\lang\*.inc.php
Add new method modx->webAlertAndQuit to use instead of errorHandler class.
Stop using errorHandler class.
Change echo & exit to webAlertAndQuit
Delete errormsg language files.
Change "event->alert"+"include mutate_*" to "manager->saveFormValues" + webAlertAndMsg
Change webAlert() to webAlertAndQuit() and mode webAlert() to deprecated.functions.inc.php
Merge pull request #177 from Segr/develop

Delete old error handler