Fix ptsym error occuring for weird setups and old inp file
Some setups require the search for a common position factor for the first two atom coordinates, otherwise symmetry may not be fulfilled For certain atom groups. I fixed this for the old inp file by adapting old code (probably from Christoph) to the new fleur. However, I suggest using the inp.xml input file. Here the position factor scheme is more flexible as an own factor is determined for each coordinate.
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