hierarchic: fix axes orientation of 6th face of 3_8
hierarchic: fix axes orientation of 6th face of 3_8

- tests/test_poly_spaces.py passes now :)

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