Extending eln solar cell base classes

Merged Jose Marquez Prieto requested to merge extending_ELN_solar_cell_base_classes into develop

Added the missing solar cell base class SolarCellEQE (from #962 (closed)) and fix a bug from a normalizer of the SolarCellJVCurve base class. @himanel1 could you look at this since you also looked at the implementation of the other classes? Extending unit tests will follow.

Edited by Jose Marquez Prieto

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