update handling of materials in ShapeOptimFlowCase.create_evaluables()
update handling of materials in ShapeOptimFlowCase.create_evaluables()

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