removed commented declaration
hosted several tool operations to create random matrices

. ListOfDegreesOfMultiGradedRing
. MonomialMatrixWeighted
. RandomMatrixBetweenGradedFreeLeftModulesWeighted
. RandomMatrixBetweenGradedFreeRightModulesWeighted
(outsourced from GradedRingForHomalg v2013.07.14)