Issue #22336 by quicksketch, rfay, scor, Rob Loach, boombatower, tstoeckler, kbahey: Move all core Drupal files under a /core folder to improve usability and upgrades.

- Patch #635212 by sun, David_Rothstein, ryandekker, tstoeckler: fallback format is not configurable.

- Patch #11218 by David_Rothstein, sun, quicksketch, duncf, awood456, dropcube, mgifford | pwolanin, dww, RobRoy, Crell, webchick, beginner, ray007, bjaspan, chx, Gábor Hojtsy, Steven, Dries, lutegrass, sym, guardian, matt2000, geerlingguy, SeanBannister, matt westgate, com2, praseodym: allow default text formats per role, and integrate text format permissions.

before a form builder function, to facilitate common form elements. Clean-up
from form_builder changes from CTools patch. Has nice side-benefit of making
all form functions' signatures consistent.

- 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.

- Patch #546336 by sun, dropcube: code clean-up and documentation improvements for the filter hooks.

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