#568224 by Josh Waihi and chx: Fixed missing constant in filter value. (all pgsql tests pass now. woohoo! :D)

- Patch #559658 by sun, dropcube: store filter settings per format, general API clean-up and documentation improvements.

- Patch #428296 by dropcube, sun, catch: filter system doesn't communicate with other modules about filter format changes/deletions.

#497118 by chx, catch, pwolanin, JoshuaRogers, and Jacob Singh: Remove the function registry. While the hope was that this would result in improved performance for low-end hosts, it comes at the expense of critical development experience problems and less benefit than something like APC. Class registry remains intact to facilitate autoloading.

Of all the patches to accidentally commit without a message. :( Rolling back registry rip. Let's try that again.

#326539 by JohnAlbin, sun, cha0s, ultimateboy, Rob Loach, Damien Tournoud: Convert 'class' attribute to use an array, not a string.

#446898 by RoboPhred: Change URL of text formats settings page to admin/settings/formats rather than filter.

- Patch #244904 by edkwh, keith.smith: renamed 'input format' to 'text format' based on UMN usability study.

- Patch #219584 by keith.smith, Bevan, SteveJB: rename operation in Input Formats from 'Configure' to 'View Configuration'.

- Patch #335086 by recidive: rename node, filter and comment module tables to singular for consistency.  Oh my.

- Patch #331570 by recidive: rename block module tables to singular.  Requires you to run update.php.

- Patch #252013 by Eaton, pwolanin, Susurrus et al: drupal_render() now printes #markup, not #value.

- Patch #245115 by kkaefer, John Morahan, JohnAlbin et al: after a long discussion we've decided to make the concatenation operator consistent with the other operators.

- Patch #222183 by Gabor and Keith: make the input formats reorderable as a first step towards better input format handling, and ultimately, good WYSIWYIG support.

#194579 patch by pwolanin: clear filter cache when allowed HTML tags configuration changes in an input format