6b09ef8760dcc298cf96ad858a4971244eed63f3 Take care of user-supplied function by checking whether mode_compute is numeric

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 205 | PASS: 204 | FAIL: 0 | XFAIL: 1 | XPASS: 0

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 203 | PASS: 202 | FAIL: 0 | XFAIL: 1 | XPASS: 0

A full log can be found on karaba in '/tmp/dynare-master-check-BJV4in7epb.log'.