CRM-13726, Contribution, Event billing blocks, - Only add same as above

checkbox if there is an address above

Conflicts:
	CRM/Contribute/Form/Contribution/Main.php
	CRM/Core/BAO/UFField.php
	CRM/Event/Form/Registration.php

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* CRM-13726: Only show 'billing addres is same as above' checkbox if there is an address above
  http://issues.civicrm.org/jira/browse/CRM-13726