- complete signature to be `run`
- fix test
- orangecontrib: make inheritance to `Registered` instead of `OWEwoksWidget`
Because `OWEwoksWidget` enforce to use the defined ewokstaskclass which is not something we want for now (avoid task associated with gui, processes on threads...)

- refactor types to create submodule
- Spectra is now a class instead of a simple list from XasObject
- Spectra contains data which is a numpy ndarray of Spectrum. This was it is simpler
to reshape it andd should offer some flexibility for the futures.
- this is the main PR but several smaller one are expected to come for cleaning...

This require the creation of some helpers to link io and XasObject, this is the goal of xas.core.io.

- simplify the bases structure Spectrum and XASObject to be more generic and continue workfing with pymca.

- simplify the bases structure Spectrum and XASObject to be more generic and continue workfing with pymca.

- create callable classes in order to get the setParameters function.
- copy parameters to the xas_obj processed.
- /close #2

- we can convert .ows to a gui free workflow.
- user can give input and output file to overwrite the one existing in xas.

./bootstrap.py xas process pymca_workflow.ows -i /usr/share/pymca/EXAFS_Cu.dat -o ./output.h5