Remove getPagingColumn() / getReversePaging()

Summary: Ref T7803. Remove these in favor of more generalized paging and ordering.

Test Plan: Sorted and paged results in various applications.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7803

Differential Revision: https://secure.phabricator.com/D12378

src/applications/base/controller/PhabricatorController.php

@@ -559,7 +559,6 @@ abstract class PhabricatorController extends AphrontController {
       ->setViewer($viewer)
       ->withObjectPHIDs(array($object->getPHID()))
       ->needComments(true)
-      ->setReversePaging(false)
       ->executeWithCursorPager($pager);
     $xactions = array_reverse($xactions);