system inversion
[sl2]=invsyslin(sl1)
:sl1,sl2 syslin lists (linear systems in state space representation) :
Utility function. Computes the state form of the inverse sl2 of the linear system sl1 (which is also given in state form).
The D-matrix is supposed to be full rank. Old stuff used by inv(S) when S is a syslin list.