move NurbsPatch-related code in IGDomain.__init__() to NurbsPatch.__init__()
move NurbsPatch-related code in IGDomain.__init__() to NurbsPatch.__init__()

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