Rollback of #1174602. This is a clean-up patch rather than a bug fix, and could have implications in contrib.

Issue #1234834 by catch: Fixed user_update_7006() causes fatal errors when trying to fill 'module' column of permissions table on disabled modules.

Issue #1231856 by lyricnz: Fixed menu_update_7001() breaks when updating from 7.4 or upgrading from D6.

- Patch #732992 by adrinux, sreynen, David_Rothstein, jensimmons, Damien Tournoud, marcingy, Dave Reid | Sp.Shut: Added Allow filter_xss_admin() to accept HTML5 tags.

- Patch #1078398 by xjm, BayerMeister: Fixed taxonomy_implode_tags() modifies term objects (instead of cloning) and adds extra ' when called multiple times.

- Patch #1234316 by agi.novanta: fixed Notice: Undefined property: stdClass:: in forum_node_update() (line 373 of /.../modules/forum/forum.module).

- Patch #1239376 by Dave Reid: .ogg file extension incorrectly mapped to 'application/ogg' in file_default_mimetype_mapping().

This reverts commit 132aed37.

Issue #717834 by David_Rothstein, clemens.tolboom, catch: Fixed The dependencies declared in core's hook_update_dependencies() implementations aren't actually correct.

- Patch #1184082 by googletorp: like queries failing on postgres with standard_conforming_strings() turned on.

Issue #981524 by das-peter, Pisco, sun: Fixed system_date_format_save() doesn't save localized date formats.

- Patch #1216886 by pounard: _lock_id() shouldn't use drupal_static(), any cache clear would potentially make locks stall.

- Patch #1224802 by kiamlaluno: DrupalLocalStreamWrapper::stream_open() uses a local variable instead of the argument passed by reference.

- Patch #774040 by B-Prod, mattyoung: theme_item_list() function duplicates last  value when dealing with children.

Issue #1174444 by Boobaa, xjm, Dave Reid: Make the _element_validate_()* functions in field.module available for all contrib modules to use.

Issue #1174444 by Boobaa, xjm, Dave Reid: Make the _element_validate_()* functions in field.module available for all contrib modules to use.

- Patch #1174686 by ksenzee: overlay parent improperly opens child overlay on specific external links.