Issue #2015789 by fubhy, echoz, rteijeiro, LewisNyman, penyaskito: Remove language_css_alter() (RTL stylesheets) in favor of HTML 'dir' attribute.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.

Issue #1662974 by barraponto, droplet, Albert Volkman, nitvirus, roborn, David Hernández: Clean up css in dblog.

Issue #1858600 by sun: 'Filter log messages' details on Recent log messages page applies bogus floats.

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

- Patch #1024328 by pillarsdotnet, droplet: re-use message-16-error.png icon for dblog severity levels higher than LOG_ERR.

#874370 by Jeff Burnz, aspilicious, Cliff, mgifford, yoroy, et al: Fixed System messages need identifying icons (WCAG 2.0).

- Patch #228576 by sun: too ambiguous stylesheet in dblog.css when form_altering the watchdog table.

#145737 by yhager, documentation cleaned up by myself: add support for RTL CSS overrides and default RTL CSS override files for modules
Note: properties, which are different in the RTL display are marked with /* LTR */ in default CSS files now,
so maintainers remember that changing them should also have an effect on RTL CSS files.

This should open the way for better RTL (right-to-left written) language (such as Arabic and Hebrew) support.

- Patch #67893 by kbahey, dww, alienbrain, asimmonds et al: made it possible to filter log messages in the database log.

- Patch #63881 by kbahey and jakeg: improved Drupal's logging functionality.  Added support for external loggers, and included a small syslog module into core.