update make_inverse_connectivity() to return optionally the offsets
update make_inverse_connectivity() to return optionally the offsets

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