tv_mdiff rounds incorrectly
See XXXX lines in the unit tests I added in f05a213fe1706ce3ba76e12dc8e6f36f74c92794 : those lines fail, because of the rules for C negative division. The fix is trivial.
See XXXX lines in the unit tests I added in f05a213fe1706ce3ba76e12dc8e6f36f74c92794 : those lines fail, because of the rules for C negative division. The fix is trivial.