Merge pull request #280 from francisco-dlp/BUG_FIX_FEI_reader

BUG-FIX: the FEI reader was raising an exception when loading files with...
Merge branch '0.7.1'
Merge branch '0.7.1'
Merge pull request #281 from to266/BUGFIX_EELSmodel_weights

Bugfix eels model weights
Merge pull request #283 from francisco-dlp/BUG_FIX_FEI_energy_scale

Bug fix fei energy scale