civicrm-47: update to 4.7.13

civicrm/CRM/ACL/API.php

civicrm/CRM/ACL/BAO/ACL.php

civicrm/CRM/Activity/BAO/Activity.php

civicrm/CRM/Activity/BAO/ICalendar.php

civicrm/CRM/Activity/Form/Activity.php

civicrm/CRM/Activity/Form/ActivityFilter.php

civicrm/CRM/Admin/Form/PaymentProcessor.php

civicrm/CRM/Admin/Form/Preferences/Contribute.php

civicrm/CRM/Admin/Page/APIExplorer.php

civicrm/CRM/Admin/Page/Extensions.php

civicrm/CRM/Batch/Form/Entry.php

civicrm/CRM/Case/DAO/CaseContact.php

civicrm/CRM/Case/Form/CaseView.php

civicrm/CRM/Case/Page/AJAX.php

civicrm/CRM/Contact/BAO/Contact.php

civicrm/CRM/Contact/BAO/Group.php

civicrm/CRM/Contact/BAO/GroupContact.php

civicrm/CRM/Contact/BAO/Query.php

civicrm/CRM/Contact/BAO/SavedSearch.php

civicrm/CRM/Contact/Form/Contact.php