CRM-14128 - Participant Count Report offers 'is not role' criteria - but treats it the same as 'is role'

http://issues.civicrm.org/jira/browse/CRM-14128
Merge branch '4.4' into CRM-14128
CRM-14128 - change to mhas

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* CRM-14128: Participant Count Report offers 'is not role' criteria - but treats it the same as 'is role'
  http://issues.civicrm.org/jira/browse/CRM-14128
Merge pull request #2459 from deepak-srivastava/CRM-14128

CRM-14128 - make mhas available, make where() generic