added ProblemDefinition.from_conf_file()
added ProblemDefinition.from_conf_file()

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