#696052 by Dave Reid: locale module variables are not properly uninstalled when the module is removed, causing fatal errors (backport of #347288)

- Patch #164532 by catch, pwolanin, David Strauss, et al.: improve table indicies for common queries.

#194595 report by hass, patch by myself: native language name is required, so we need to fill it in the updates - also omit it in user listing if the same as the translated language name

#184867 by deekayen, catch and keith.smith: fix some spelling errors in our source code and messages printed

- Patch #150245 by webchick, bjaspan, ralf, Arancaytar et al: move the .schema files into .install files to prevent mistakes.

#171646 by JirkaRybka: store version usage information for every source string, optimize caching and prune the initially unused strings

#150521 by myself: streamline locale runtime performance and clean up code by not storing empty translations

#118026 by kkaefer with fixes from myself: JavaScript translation support and script.js as a default theme JS file to use, if found

#128866 by myself: bjaspan noted that the pgsql and mysql updates on locale_update_6002() are reversed, I noted that the variables table got the language column inadvertently

- Patch #79428 by Chris Johnson: remove int display width declarations from MySQL create table statements.

- Patch #68926 by chx, jeremy, steven, eaton, webchick, amazon, neil, nedjo et al: an initial install system for Drupal core.