update gen_block_mesh() to generate also 2D meshes
update gen_block_mesh() to generate also 2D meshes

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