CRM-13809, prevent sending emails to deceased contacts, also code clean up/optimizations

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* CRM-13809: send email activity: cc may go to wrong contact
  http://issues.civicrm.org/jira/browse/CRM-13809
CRM-13809, notic fixes and batch mode fixes

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* CRM-13809: send email activity: cc may go to wrong contact
  http://issues.civicrm.org/jira/browse/CRM-13809
Merge pull request #2121 from kurund/CRM-13809

CRM-13809, prevent sending emails to deceased contacts..