Issue #1541892 by Rob Loach: Convert TableSort to PSR-0.

core/includes/tablesort.inc

core/lib/Drupal/Core/Database/Query/TableSortExtender.php

core/modules/comment/comment.admin.inc

core/modules/dblog/dblog.admin.inc

core/modules/forum/forum.module

core/modules/node/node.admin.inc

core/modules/path/path.admin.inc

core/modules/poll/poll.pages.inc

core/modules/statistics/statistics.admin.inc

core/modules/statistics/statistics.pages.inc

.../Drupal/system/Tests/Common/TableSortExtenderUnitTest.php

core/modules/system/system.admin.inc

...s/system/tests/modules/database_test/database_test.module

core/modules/user/user.admin.inc