#290766 group admins were missing their powers when og_access disabled. reworked og_is_node_admin(). as a result, we no longer require that the group node be authored in the default input format.

Make available to javascript code the group context of a page. See Drupal.settings.og ...  Useful for adding group context info into ad tags or Google Analytics (for example).

#249902 array errors. also improve hook requirements and admin/og/og a little when no groups have been specified.