I have now checked with cvsps.py from the hg/crew repository.  Even when using
the same fuzz factor of 300, the result differs slightly: (1) changeset dates
often deviate by a couple of minutes, (2) the changeset boundaries are sometimes
a bit different (very rarely).

In general both results of the old cvsps-2.1 (after an adhoc patch) and your
cvsps.py look reasonable.  So I wonder if everything is actually OK, and the new
script merely uses different ways to interpret cvs dates.

Is this the proper place to continue this discussion of testing cvsps.py?