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

[io] rework spectrum, to separate exafs and FT. Should even be other variable. Update the output configuration

- 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