new Mesh.__add__() to merge meshes
new Mesh.__add__() to merge meshes

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