lack of clarity in the meaning of "PTMPos"

[mlocardpaulet]

The way I understand it:

• in the ground truth table "PTMPos" is the position in the protein, and the names should be ignored and are confusing.
• in the StatsPep table "PTMPos" is the position on the peptide
• in the occupancy outputs of the simulation "PTMPos" is the position in the peptide, and there is a "ProteinPTMPos" that has the position in the protein

So: no real issue, but it can be a bit confusing for users

I propose either to:

1. specify "ProteinPTMpos" and "PeptidePos" everywhere, but I see how it could create issues to rename these headers.
2. provide a complete description of the headers in the different tables somewhere easy to find. I