/close #328

Use TomoBase as base class for processing + Integrate axis

See merge request tomotools/tomwer!187

[luigi] keep (minimum) compatibility for the luigi prototype since process work with TomoBase object

[core][darkrefs] fix unit test since the process is not returning any issue but just a log and some file in self._originalsDark and self._orignalsRefs where not registred with the full path

[core][datawatcher] skip datawatcher test if not on unix. Data watcher has probably to be retwrite anyway to be simplify

- now all process handler function take a TomoBase or a dict in input and return a TomoBase or a dict in output (defined by _set_return_dict).
- add unit test for process classes to check inputs and outputs.
- for now datalist and datawatcher still have a particular behavior.
- refactore some unit test to move them in core.process.test instead of core.test

Conflicts:
	.gitlab-ci.yml

[test] rework orangecontrib/tomwer/widgets/test/test_ftseries.py since ReconsParams is an object and process need an instance of TomoBase