fix region shape, Region.get_n_cells() in 2D
fix region shape, Region.get_n_cells() in 2D

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