Avoid subscriptions to "group" and instead redirect all to "grouptype".

(Work in progress)

Add a block display to the og_my View. Shows user's groups and number of new posts in each (if any). Exactly like the My groups block at groups.drupal.org.

This patch needs to be backported based on the outcome of #364734.

#345711 by Amitaibu. Let modules alter Og grants before written to the DB. makes it easier to support multiple node access modules along with custom business logic.

#345857. 'My groups' at path og/my show raw code ... Also switched one hook_form_alter branch to use the form_id specific variant.