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

This reverts commit bf6fd922.

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.

- 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.

Issue #1295502 by pillarsdotnet: Fixed Add missing '$' character to docblock for timer_start(), timer_read(), and timer_stop() functions.

Issue #1295502 by pillarsdotnet: Fixed Add missing '$' character to docblock for timer_start(), timer_read(), and timer_stop() functions.

Issue #1167218 by droplet, kathyh: Fixed DatabaseStatementInterface::fetch* - document what empty return value is.

Issue #1297506 by alberto56: Fixed non-English installation: Call to undefined function _locale_import_read_po() in ../includes/install.inc on line 1113.

Issue #1011614 by catch: Fixed Theme registry can grow too large for MySQL max_allowed_packet() and memcache default slab size.

Issue #951644 by David_Rothstein, aschiwi, xjm: Fixed Requirement warnings (e.g. for PHP memory limit) are not shown on install or update unless there is a requirement error also.

Issue #1295462 by pillarsdotnet: Fixed Add missing '$' character to docblock for _theme_load_registry() function.

Issue #1291458 by arithmetric: Fixed Database::getConnection mentions short-lived fixed bug and shouldn't.

Issue #825972 by daniels220, Reidsy: Fixed sess_write()/sess_read() documentation should recommend  instead.

Issue #1113588 by pillarsdotnet: Added Provide find_conf_path() function by re-factoring reusable code from existing conf_path() function.

Issue #561858 by effulgentsia, sun, rfay, Nick_vh, merlinofchaos, katbailey, dereine et al: documentation and tests for drupal_add_js() and drupal_add_css() with the AJAX framework.

Issue #520106 by JohnAlbin, pillarsdotnet, chx, sun, drifter: Fixed No way to dynamically set active trail.