CRM-14008 alter update greeting to update blanks as well as null

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* CRM-14008: Addressee greetings not being updated when they are empty
  http://issues.civicrm.org/jira/browse/CRM-14008
fixes #1 and #2 for CRM-14052

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* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
worked on #2 fixes, CRM-14052

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* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
do not create/delete tags via tagset unless explicit save, CRM-14052

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* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
fixes to case view tagset and tags CRM-14052

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* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
fixes for entity delete function, CRM-14052

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* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
Merge pull request #2236 from eileenmcnaughton/CRM-14008

CRM-14008 alter update greeting to update blanks as well as null
Merge pull request #2298 from kurund/tagset-fixes

CRM-14052: Tagset fixes