Converts a tsmat into time series
argout=tsmat2ts(tsmat)
tsmat = a tlist of type tsmat
argout = 0 or n ts with n the number of time series in the tsmat
tsmat=db2tsmat(GROCERDIR+'/data/bdhenderic.dat');// trasnforms Hendry and Ericsson database into a tsmat tsout=tsmat2ts(tsmat);//recovers the variables rnet, lm1, lp, ly from the tsmat