recovers objects names in a system of equations
[lx,listcoef,ncoefeqs,xx,namexos,boundsvarb]=syslist(l,coef,boundsvarb)
l = a list of k equations
coef = a (mx1) vector of coefficients names
boundsvarb = a vector of bounds or []
lx = the list of all endogenous variables
listcoef = the list of coefficients
ncoefeqs = the list pf sizes of coefficients for each equation
xx = matrix of exogenous varaibles
namexos = the vector of their names
boundsvarb = the vector of bounds