fix CMesh.setup_connectivity() to update all connectivity pointers
fix CMesh.setup_connectivity() to update all connectivity pointers

- new CMesh._update_pointers()

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