delete tags that belongs to tagset, CRM-14052

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* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
more fixes for delete of tags in a tagset
more fixes for delete of tags in a tagset
few more fixes for tagset delete logic, CRM-14052

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* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
added more comments for the code, CRM-14052

----------------------------------------
* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
added more comments for the code, CRM-14052

----------------------------------------
* CRM-14052: Tagset fixes
  http://issues.civicrm.org/jira/browse/CRM-14052
Merge pull request #2320 from kurund/CRM-14052

delete tags that belongs to tagset, CRM-14052