BUG-FIX: the hydrogenic xs were raising an exception when Z<13 and Z>36 because Egerton's original code was not designed to work out of this range
Add correction factor parameters for Na and Mg to the Hydrogenic XSs so that they better match HS XSs
EHN: axis='auto'
EHN: number_of parts and step_sizes = 'auto'
EHN: step_sizes=int
EHN: smaller dim
EHN: Suppress mapped_parameters.splitting option
EHN: replace .squeeze()
EHN: update test
EHN: doc
EHN: add mass absorption
EHN: tidy up element_EDS
EHN: litterature
SUP: suppress all mass absorption coefficient
EHN: stor stacking
ENH: axis='reverse_stacking'
ENH: doc
ENH: tests
EHN: example in doc
DOC: correct doc