diff tests/0015/run-test.sh @ 280:3be15407e814

Merge sampling branch (-r361:405, though I hope that the branch is now
finished) onto trunk.  API developers take note.

Things still to clear up:
* whether the threshold distance it currently reports bears any relation
  to reality;
* if not, how to bring it a bit more into alignment;
* minor code cleanup issues in sample.cpp;
* incorporating --absolute-threshold handling into sampling;
* writing suitable test cases.