991b13b1808c57554d4d354b02c439203c5ba261 Ref. manual: fix paths for Debian/Ubuntu packages.

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 428 | PASS: 426 | FAIL: 0 | XFAIL: 2 | XPASS: 0

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 426 | PASS: 424 | FAIL: 0 | XFAIL: 2 | XPASS: 0

A full log can be found on karaba in '/tmp/dynare-4.4-check-a9cXvjFfCE.log'.