ori: fix Approximations.setup_bubble_dofs() for several groups
ori: fix Approximations.setup_bubble_dofs() for several groups

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