FIX TYPO: various typos in signal.save docstring
Merge branch 'master' of https://github.com/hyperspy/hyperspy
Merge branch 'master' into edslab
EHN: model better starting value
EHN: examples for edsmodel
EHN: xray option for fit_energy and line_weight
EHN: tidy up database
EHN: improve model

units_factor, family_lines, line_energy  and resolution 'all'
NEW: interactive examples