#368729 by meba: (i18n sprint) Fix error during multilingual installation because of NULL value on required field.

- 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!

#88264 by Rob Loach and kscheirer: Make variable_get()'s defaultparameter default to NULL so that NULLs do not need to be specified.

#364777 by Eaton, EclipseGC, JohnAlbin, and Rob_Feature: Add a 'stripped down' CSS theme to core to demo Drupal's default markup. Say hello to stark.

#242962 by Heine: Add a 'tablesort' Form API element to unify various places we use a big table with JS-enabled checkboxes next to each item (with tests).

#144969 by beginner, Wim Leers, and catch: Fix count returned by taxonomy_term_count_nodes() with multi-select vocabularies (with tests).

- Patch #351235 by dmitrig01, webchick, frando, moshe weitzman, et al: hook_page_alter.  Oh, behave.

#363262 by catch and Damien Tournoud: Replace src index on the {url_alias} table with src, language for better performance.

#362423 by chx: Include session.inc during installer to avoid fatal errors if things don't go exactly according to plan.

- Patch #334956 by JohnAlbin: remove a IE hack 'flash of unstyled content' that is no longer needed.