Testsuite: compatibility fix for older MATLAB

addpath does not deal well with relative path on older MATLABs.
3 jobs for master in 55 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #6529
test_matlab

00:00:35

passed #6531
test_octave

00:00:53

failed #6530
test_old_matlab

00:00:03

 
Name Stage Failure
failed
test_old_matlab Test

Error in ==> createReport at 41
rep.addPage('title', 'Jan1 vs Jan2', ...

Error in ==> runtest at 26
createReport(dc_a, dc_q, db_a, db_q);
}
>> make: *** [Makefile:11: check-matlab] Error 1
ERROR: Job failed: exit status 1