make vertex_maps common, fix LagrangeTensorProductPolySpace._define_nodes()
make vertex_maps common, fix LagrangeTensorProductPolySpace._define_nodes()

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