deba [Fri, 14 Oct 2005 10:49:51 +0000] rev 1720
Matrixmaps moved to own file
deba [Fri, 14 Oct 2005 10:48:34 +0000] rev 1719
Traits moved to own file
Tag for reference maps
Possibility to handle proper the return type
of the operator[]() const -- value or reference