87b4254ce511c8cab3e583adbc0f89a7e1825b6d reporting: remove checks on colors that are passed to graphs/series to allow for all color combinations supported by TikZ

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 453 | PASS: 449 | FAIL: 2 | XFAIL: 2 | XPASS: 0 | LIST OF FAILED TESTS: | * ep/rbc.mod | * ep/rbcii.mod

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 451 | PASS: 447 | FAIL: 2 | XFAIL: 2 | XPASS: 0 | LIST OF FAILED TESTS: | * ep/rbc.mod | * ep/rbcii.mod

A full log can be found on karaba in '/tmp/dynare-master-check-AF5ZGuwMW5.log'.