CRM-13849 - Mailing search should not be restricted to specific mailings when mailing events are specified

http://issues.civicrm.org/jira/browse/CRM-13849
CRM-13849 - eliminate unused formRule function

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* CRM-13849: Mailing search should not be restricted to specific mailings when mailing events are specified
  http://issues.civicrm.org/jira/browse/CRM-13849
Merge pull request #2109 from dlobo/CRM-13849

CRM-13849 - Mailing search should not be restricted to specific mailings when mailing events are specified