Fix tests

Updated reference output for tests to reflect:

1. updated alpha_s order in LHAPDF output
2. updated 'total unc.' column in fittedresults.txt (ALLDATA)
3. some small differneces in output PDFs in some tests (not really understood, let's see if it works for other people)
4. some tests seem to have different set of MINUIT commands (again let's see if it works for other people)
5. the usual issue with profilerLHAPDF (different number of eigenvectors)

Additionally, I changed test.sh to improve recognition of proper numdiff (now it checks for numdiff -v)