Issue #362889 by Xano, andypost, dawehner, Davy Van Den Bremt, cweagans, sun: Move drupal_common_theme() from common.inc into theme.inc.

Issue #336697 by oriol_e9g, xjm, jbomb, Davy Van Den Bremt, coltrane, lyricnz: Optional vid argument for taxonomy_get_term_by_name().

#556872 by Davy Van Den Bremt, pwolanin, sun, and eojthebrave: Fixed Action links do not work on all levels (example: 'add block' action link does not appear).

- Patch #503782 by skilip, Davy Van Den Bremt, eojthebrave, sign: not able to select region at block creation.

- Patch #556390 by sun, Dave Reid, Davy Van Den Bremt, Rob Loach, yoroy: vertical Tabs on block visibility settings.

#560944 follow-up by brandonojc, seutje, and Davy Van Den Bremt: Move collapsible fieldset logic from theme_fieldset() hook to form_process_fieldset().

#321828 by Davy Van Den Bremt and Damien Tournoud: Move template_preprocess_maintenance_page() to theme.inc to allow Drupal to properly report fatal errors.

#561970 by Davy Van Den Bremt: Rename 'box' to 'custom block'. Here's to core's database schema making sense.

- Patch #262906 by Davy Van Den Bremt, mooffie: bogus form_build_id_/nodetype/ variable created on type settings page.