fix bug 501: remove aggressive mat/scalar optimization (was replaced by mat*(1/scalar) for non integer types)
fix bug 501: remove aggressive mat/scalar optimization (was replaced by mat*(1/scalar) for non integer types)

pthulhu/eigen,cjntaylor/eigen,cjntaylor/eigen,pthulhu/eigen,pthulhu/eigen,cjntaylor/eigen,cjntaylor/eigen,pthulhu/eigen,pthulhu/eigen