added Region.iter_cells()
added Region.iter_cells()

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