fix Region.get_facet_indices() for inner cell "corners"
fix Region.get_facet_indices() for inner cell "corners"

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