og 6.x-1.0-rc3

Changes since DRUPAL-6--1-0-RC2:

• #280363 by tmcw. array_fill, implode, and SQL errors on load of og without any content types defined
• #280501 by tmcw. Start porting the simpletests.
• fix access denied on unsubscribe page.
• remove notice on node edit form when user has no memberships.
• #282148 by hass. Remove context insentive strings.
• #280501 by tmcw. SimpleTest tests are not updated for Drupal 6 head. tests are cleaner now, a bit more thorough, and almost all passing.
• #281766 by hass. move images into own folder. also new opml icon.
• #280682 by moshe weitzman. fix search form so that it does not error when submitting a different form on the page (like comment form).