- 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...

# Conflicts:
#	est/core/process/process.py
#	est/core/process/pymca/test/test_io.py
#	est/core/process/test/test_roi.py
#	est/core/test/test_types.py
#	est/io/io.py
#	est/setup.py

# Conflicts:
#	est/core/types.py
#	requirements.txt