Merge pull request #490 from yashodha/more-CRM-12274

CRM/Activity/BAO/Activity.php

CRM/Activity/BAO/ActivityAssignment.php

CRM/Activity/BAO/ActivityContact.php

CRM/Activity/BAO/ActivityTarget.php

CRM/Activity/BAO/Query.php

CRM/Activity/Page/AJAX.php

CRM/Activity/Selector/Search.php

CRM/Campaign/BAO/Query.php

CRM/Campaign/BAO/Survey.php

CRM/Case/BAO/Case.php

CRM/Case/Form/Activity.php

CRM/Case/XMLProcessor/Process.php

CRM/Case/XMLProcessor/Report.php

CRM/Contact/BAO/Query.php

CRM/Contact/Form/Search/Custom/ActivitySearch.php

CRM/Contact/Form/Task/PDFLetterCommon.php

CRM/Core/BAO/ActionSchedule.php

CRM/Friend/BAO/Friend.php

CRM/Logging/Differ.php

CRM/Report/Form/Activity.php