CRM-13487 fix on d6 authentication

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* CRM-13487: User Authentication Bug in Drupal 6
  http://issues.civicrm.org/jira/browse/CRM-13487
Merge pull request #1762 from eileenmcnaughton/4.3

CRM-13487 fix on d6 authentication
Merge pull request #1758 from dlobo/CRM-13554

CRM-13554
CRM-13572 - Upgrader - Display pre-upgrade message about OFC

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* CRM-13572:
  http://issues.civicrm.org/jira/browse/CRM-13572
CRM-13572 - Upgrader - Delete OFC file and/or display message

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* CRM-13572:
  http://issues.civicrm.org/jira/browse/CRM-13572
Merge pull request #1788 from totten/4.3-ofc-delete

CRM-13572 - Upgrader - Delete OFC file and/or display message
CRM-13554

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* CRM-13554: Improve string validation in the query engine
  http://issues.civicrm.org/jira/browse/CRM-13554