2b817474cd92c8e821e2cbbc2e8e170c33d2a697 Fixes bug where number of posterior draws was computed incorrectly and wrong warning was displayed

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 432 | PASS: 430 | 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-1yuYJ6qDn8.log'.