Backported a patch from D7. Uses the Settings API in the module to define the variable_get defaults. Also added a flush facility to the page_title_get_settings function.

Major rewrite of the admin form setting handling plus some code cleanup and backporting of better use of menu system from Drupal 7

Major restructure of the page title handling - each module now has its own include which uses hook_page_title_alter and hook_page_title_pattern_alter