#915174 follow-up by David_Rothstein: More .module files that no longer need to be specified in files[].

#915174 by sdboyer, sun: Remove pointless files[] declarations on files that are not declaring classes.

#1002708 by sun: Robustify instance settings instantiation to prevent fatal errors in buggy modules.

#945112 by carlos8f, dalin, David_Rothstein: Fixed Unable to stay logged in during upgrade from D6 -> D7

- Patch #890128 by carlos8f, sumitk: comment body missing if comment module enabled after a content type module.

- Patch #821646 by David_Rothstein: dashboard prints the search form title twice on the page (can confuse screen reader users).

- Patch #669510 by David_Rothstein: upgrade path improvements for the administration theme setting/permission.

#999072 by Damien Tournoud: Fix typo in drupal_system_listing() preventing testing profile from working.

#977460 by dmitrig01, bfroehle, Josh The Geek: Fixed Cannot serialize or unserialize PDO instances error

#915906 by jbrown, yched: Fixed Deleting node type with only instance of a field leaves the field in a strange zombie state

#986296 by blup, tstoeckler, Damien Tournoud, carlos8f: Fixed _node_types_build() accidentally marks node types as disabled