Merge changes Ib67a4adf,I2354cdcf,Iecf288d4,I961671d7,I02760d10,Idb307371,Ib705b8fc,Ic6bcfab3,If66abd5b,Ia46c3c52,I847aa583,Ide4f33ab,I7b2143ac,I14c6af22,I3841a74d

* changes:
  Group collections and views in the submission drop-down (bug #786389)
  Add optgroups to pieform select element
  Use View::get_views_and_collections for submission lists (bug #786389)
  Filter by submitted views in View::get_views_and_collections
  Show submission information on collection index page (bug #786389)
  Disallow editing and deletion of submitted collections (bug #786389)
  Get the details of the entity a collection is submitted to
  Modify release form to release entire collections (bug #786389)
  Handle collection submissions in view/submit.php (bug #786389)
  Add a function to release a submitted collection (bug #786389)
  Allow required activity parameters to be specified as strings
  Separate db-specific parts from View::release
  Deal with collections in submission forms (bug #786389)
  Add submission properties to Collection class (bug #786389)
  Add submission fields to collection table (bug #786389)