Issue #692366 by underq, bradweikel, willmoy, kid_icarus | foripepe: Fixed Stop forcing language/mirror for PHP manual links.

- Patch #1497088 by acrollet: Fixed Empty configuration values should return an empty string instead of an empty array.

- Patch #1454630 by mottihoresh: user_autocomplete() page callback uses  as a local variable (coding standards, bad example).

- Patch #1322794 by scor: follow up patch fixing the 'No newline at end of file' in ie-rtl.css and ie.css.

- Patch #1322794 by JohnAlbin, alanburke, jrbeeman, rupl, Tor Arne Thune: make Stark use a responsive layout.

Issue #1015946 by pillarsdotnet, catch, bfroehle, Jej, jose.guevara, Damien Tournoud: Fixed Eliminate $user->cache and {session}.cache in favor of $_SESSION['cache_expiration()'][].

Issue #1475666 by filijonka, Devin Carlson, Kevin Morse, tstoeckler, Niklas Fiekas: Fixed PHP error because of typo in form.inc line 3025.

Issue #1479652 by Psikik, jhedstrom: Convert image style config filenames/keys from plural to singular.

Issue #1479652 by Psikik, jhedstrom: Convert image style config filenames/keys from plural to singular.

Issue #1479652 by Psikik, jhedstrom: Convert image style config filenames/keys from plural to singular.

Revert "- Patch #1479652 by Psikik: convert image style config filenames/keys from plural to singular."

This reverts commit 854ad211.

Issue #1439462 by nod_: Drop our custom $.support.positionFixed and use jQuery's $.support.fixedPosition.

Issue #1467126 by effulgentsia, Rob Loach, sun, catch, amateescu, yched, EclipseGc: Fixed Provider based PSR-0 Classes that load more than once.

Issue #1488414 by nmudgal, chertzog: Add comment to user_schema to explain why table name is plural in spite of our usual standards

Issue #158803 by clemens.tolboom, Sutharsan, Gábor Hojtsy: Hide 'Language' column in content overview table if only one language is enabled.

Issue #1324058 by isay: Fixed forum-rtl.css does not overide #forum div.indent from margin-left to margin-right.