Function File: [net] = train (MLPnet,mInputN,mOutput,[],[],VV)

A neural feed-forward network will be trained with train

          [net,tr,out,E] = train(MLPnet,mInputN,mOutput,[],[],VV);

          left side arguments:
            net: the trained network of the net structure MLPnet

          right side arguments:
            MLPnet : the untrained network, created with newff
            mInputN: normalized input matrix
            mOutput: output matrix (normalized or not)
            []     : unused parameter
            []     : unused parameter
            VV     : validize structure