In fact instead of having to repeat those definitions n times we should have some king of a database defining those once for all

- add `outputs` and `inputs` entries in processing classes used in ppfaddon aliases file.
- add `get_xas_obj` function in est.app.utils module
- mode est.app.utils._convert_spectra_dims to public

[orangecontrib] add _ParameterWindowContainer to add a auto/manual option for computation in OW from larch and pymca

[core]register_process: add a relative_to parameter to store numpy array relative to "r" values and not only "energy"

[core][larch] fix creation of the new secptrum object when overwrite is True in larch process wrappers