[IDEA] Allow manual shorting of experimental names for PG plots

[cbielow]

(mentioned in #25)

Plots derived from proteinGroups.txt (like the PCA plot) currently do not benefit from shortened Raw file names (via ), since experimental groups not necessarily correspond 1:1 to Raw files (its a n:m mapping).

We could, however, obtain the mapping from evidence.txt ('raw file' and 'experiment' column) and allow for manual editing in the report_v0.xyz_filename_sort.txt by adding three more columns

• experiment (original)
• experiment (short/display) <-- editable
• experiment (best effort)