schroedinger.py: update split of DFT and general options, update docstrings
schroedinger.py: update split of DFT and general options, update docstrings

lokik/sfepy,lokik/sfepy,RexFuzzle/sfepy,rc/sfepy,rc/sfepy,vlukes/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,vlukes/sfepy,sfepy/sfepy,vlukes/sfepy,lokik/sfepy,sfepy/sfepy,lokik/sfepy,RexFuzzle/sfepy,sfepy/sfepy,rc/sfepy