gcr 3.3.2
 - Allow changing collection on a GcrCollectionModel, add tree/list
   mode to GcrCollectionModel
 - Allow chaining of GckEnumerator objects, so that when objects from
   one is listed, then chained enumerator is enumerated.
 - Integrate GTlsInteraction into libgck for logging in or key auth.
 - Refactor internal DER parsing to use reference counted memory
   using the prototyped GBytes API.
 - Build fixes, documentation fixes, testing fixes, memory leak fixes