schroedinger: changed DFT iteration to return F(x) - x, iteration plot saving
schroedinger: changed DFT iteration to return F(x) - x, iteration plot saving

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