Issue #1668644 by Island Usurper, phayes, daffie, Brandonian, gease: PostgreSQL: Impossible to change a field to serial, bigserial, or numeric

Issue #687180 by Island Usurper, catch, Berdir, Damien Tournoud, xjm: Fixed Deleting a taxonomy vocabulary leaves term reference fields still pointing to it, and a PDO Exception when creating content.

- Patch #497206 by jhodgdon, pwolanin, Island Usurper, YannickD: avoid search conflicts with other forms, use menu API instead of search_get_keys().

- Patch #561708 by jurgenhaas, gleroux02, ksenzee, Island Usurper: theme_image() chokes if getimagesize() fails.

#685892 by Stevel, scor, Island Usurper, yched, quicksketch, et al: Fixed Upload -> File module upgrade path is broken.