Raise error if uuid invalid on load.
[fixes #40919539] fix subpersistor from session

session[persistor] creates a new persistor which shares  the current
session main persistor internal parameters.
Merge pull request #64 from maxigit/40919539_search_results_get_a_wrong_uuid

40919539 search results get a wrong uuid
Udate doc and clean breakpoint.
[fixes #41179671] fix spec validating wrong object.
[fixes #41181379] clean rspec log
Initial spec for Labellable and Label
Bump version + update doc
Merge pull request #65 from maxigit/41156857_add_label

41156857 add Labellable and Barcode
[#41156935] Init commit for labellable persistence

Needs to clean the concept about labellable
[#41156935] change contents subclass to label

Still work in progress. The spec fails.
[#41156935] still draft ver. of labellable persistence
[#41156935] Improved labellable persistence

TODO: Fix Label's Model instance
[fixes #41156935] Add label persistence

All specs passes.
Merge pull request #66 from maxigit/41156935_add_labels_persistence

41156935 add labels persistence
[#42059313] Added create Labellable action

It does not contains label(s) creation.
That will be a separate create action.
[#42059313] Added missing newline to the end of file(s)
Merge pull request #68 from ke4/42059313_add_create_labellable_action_to_the_core

42059313 add create labellable action to the core
Bumb version 16.1 and update doc
[fixes #42216835] fix labellable persistence.