-added kmeansMkI_2d -added calcdiff2d to dmlib -added plzGenNS and ageGenNS to dmtest to generate unshuffled testdata for kmeans 2d
-added kmeansMkI_2d -added calcdiff2d to dmlib -added plzGenNS and ageGenNS to dmtest to generate unshuffled testdata for kmeans 2d