.csv files of linear response values are written on first level, appended on all latters. No more .L1.csv.
Essentially, this is a fix, as it was meant to be like that before. Level in filename is not needed anymore as we are writing the correct ecut (respective to the current level) into the file. Hence, we may easily pack all into one file. This was already implemented with one of the three values but not with all and not for each PAS and non-PAS. Now, we have a if (Lev0->LevelNo == MaxLevel-2) check everywhere and OpenFile either in write or in append mode and put a header only in the former case.
Also, PAS values are now also written for the magnetic moments which was not done before (only to screen).
