CRM-13331 re-apply email send once fix but in a way more true to original
CRM-13397 dont allow contribution pages to submit more than once
CRM-13447 (closes) include domain_id in job load criteria …
CRM-13598 d6 - use  drupal mechanism to identify table prefixing
CRM-13600 NewMailing - user with no groups should be able to civimail from search