Issue #1066274 by pcambra, Damien Tournoud, xjm: Added hook_options_list() should allow to pass the instance of a field.

- Patch #735426 by yched, mr.baileys: fields with select widget: first option is selected by default even if no 'default value' set for the field.

- Patch #502190 by jhodgdon, stella, sun: hook implementation headers out of compliance with standards.

#635202 by yched and sun: Remove #process pattern from option widgets (plus buckets of tests for option widgets).

#606526 by axyjo and scor: Remove trailing whitespace and add newlines at end of files. Sorry, folks! But it is after code freeze. :)

- Patch #567064 by yched, sun: widgets done 'the easy way' have too many limitations. Removes more code than it adds!

#600974 by effulgentsia, JohnAlbin, sun, and Damien Tournoud: Allow theme functions to take one argument without any hacks. NOTE: This is an API change in hook_theme().

- Patch #470242 by yched, bjaspan: fixed namespacing for bundle names to avoid users rendering their site unusable.

- Patch #572618 by effulgentsia, pwolanin, sun: all theme functions should take a single argument. Code clean-up and performance improvement. Woot.

- Patch #572932 by sun: rename hook_elements() to hook_elements_info() for consistency. Yay to API clean-ups during 'slush'.

#306358 by dvessel, JohnAlbin, and flobruit: Add a single $classes string (and corresponding $classes_array) for all dynamic classes in template files.

#323112 follow-up by yched: Oops, Vertical Tabs broke field widgets (with tests so we don't do it again).

#369964 by yched and bjaspan: Refactor field validation and error reporting. Field API no longer coupled to Form API. Hooray.

- Patch #361683by Barry, Yves, Karen, Moshe Weitzman, David Strauss, floriant, chx, David Rothstein: initial field API patch. More work to be done, but ... oh my!