new option "return_all" of the homogenization engine
new option "return_all" of the homogenization engine

- if true, the homogenization engine returns coefficients and correctors

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