Add CLI for some routines.

 - steady,
 - check,
 - evaluate_likelihood,
 - evaluate_posterior_kernel, and
 - evaluate_prior.

*Example*

After running a mod file, on the Matlab's command line:

>> cli.check

EIGENVALUES:
         Modulus             Real        Imaginary

               0                0                0
       1.389e-16        1.389e-16                0
          0.6452           0.6452                0
          0.9707           0.9707                0
           1.038            1.038                0
       1.271e+16        1.271e+16                0
        2.33e+17         2.33e+17                0

There are 3 eigenvalue(s) larger than 1 in modulus
for 3 forward-looking variable(s)

The rank condition is verified.