changed name of parameter

Leo Michel-Dansacrequested to merge
dev-leo into master

The name of the parameter nphotons or nphot was changed to nPhotonPackets for the three programs PhotonsFromStars.f90, PhotonsFromSourceModel.f90, and LyaPhotonsFromGas.f90. (the variable name in these codes has also been homogenized and is nphotons everywhere).

NB: commits cherry-picked from the develop branch.

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