registry: missing function addition

* Adds missing dict-like functions iteritems and get to the new dict
  registry DictModuleAutoDiscoverySubRegistry.

* Updates some docs.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: holding pen fixes

* Fixes an issue getting widgets in an unsupported way.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>