Revert "Issue #1313790 by greggles: Remove unused and undocumented  from drupal_rewrite_settings()."

This reverts commit bf6fd922.

Issue #789484 by Lars Toomre, pillarsdotnet, michaellenahan, sven.lauer, Mac_Weber: Fixed Confusing documentation for  argument in hook_access()/hook_node_access().

Issue #766382 by neoglez, pebosi, andypost, sarah_p: Fixed Column 'nid' is ambiguous when using node access modules.

Issue #1310250 by joelcollinsdc: Fixed Improve reverse proxy ip address handing commenting and documentation.

Issue #1307062 by sven.lauer, jhodgdon: Fixed install file hooks should state whether module code is available.

Issue #1066274 by pcambra, Damien Tournoud, xjm: Added hook_options_list() should allow to pass the instance of a field.

Issue #1129642 by jbrown: Fixed Populate HTML image tags with dimension attributes (like D6 imagefield) without re-introducing I/O.

Issue #221712 by Damien Tournoud, Gábor Hojtsy, iliphil, Bodo Maass, idflood, loganfsmyth: Fixed locale_language_from_browser() doesn't parse language tags correctly, has a broken logic.

Issue #789484 by Lars Toomre, michaellenahan, sven.lauer: Fixed Confusing documentation for  argument in hook_access()/hook_node_access().

Issue #943924 by Merco, lotyrin, eojthebrave: Fixed Allow preview of private image on node add form.

Issue #1041906 by Monochrome, bobodrone, ELC, ctibor, DamienMcKenna: Fixed Taxonomy term menu link title overrides term page title.

Issue #1002734 by pillarsdotnet, yched: Fixed Multiple 'Undefined index' notices in modules/field/modules/number/number.module.

- Patch #1309298 by sven.lauer: document that hook_(en|dis)able implementations should live in .install files.

- Patch #1307332 by pillarsdotnet: improve the docs for DrupalLocalStreamWrapper::getLocalPath() function.

Issue #1258176 by sven.lauer: API doc for element_children() is only useful for people who already know what 'children' are.

- Patch #1281932 by loganfsmyth: convert Drupal.t and Drupal.formatPlural regular expressions to extended form.

- Patch #1280522 by dcmouyard: _filter_autop() (line break converter) does not recognize html5 block level elements.

- Patch #1280530 by loganfsmyth: decouple domain/path negotiation setup from language configuration.

- Patch #1183430 by TR, oriol_e9g: t function strings should not have whitespaces at beginning or end.