- Patch #306027 by agentrickard, catch, dereine, Dave Reid, drewish, et al: automatically clean the {role_permission} table when modules are uninstalled.

- Patch #453254 by Pasqualle, Gábor Hojtsy: re-introduce per-content type visibility to block settings.

- Patch #497612 by Moshe Weitzman et al: harden user login by correctly using the form API.  Complete commit now.  Thank you, thank you.

#504428 follow-up by keith.smith: Remove 'now' from all empty admin screen texts. Steve Krug would be proud.

#495956 by andypost, cafuego, fiasco: Convert initial queries in system_install() to DBTNG to stop weird inconsistencies on various platforms.

#460706 by wulff and c960657: Don't show surrounding fieldset on user registration form when only one profile category exists.

#482346 by Berdir: Move module installation logic to module_enable() to prevent errors upon enabling modules.

#333171 by catch: Provide cache_get_multiple() and allow clearing of multiple cache IDs at once (with tests).