ss2Mss - Takes a ss object and translates it to an mss object
Input parameter - lsys: lss-object, linear state-space model of type 'ss' - normtype - type of CPN norm. Currently only the 1-norm CPN is supported
Output parameter -msys: mss object - multilinear time-invariant state space model
Example: mysys=mss.ss2Mss(lsys,'1')