cache layouts of operands in ExpressionBuilder.apply_layout()
cache layouts of operands in ExpressionBuilder.apply_layout()

BubuLK/sfepy,rc/sfepy,sfepy/sfepy,sfepy/sfepy,rc/sfepy,vlukes/sfepy,vlukes/sfepy,BubuLK/sfepy,rc/sfepy,BubuLK/sfepy,vlukes/sfepy,sfepy/sfepy