Log Message:
Upgrade to 1.40.

1.40: 2016-09-07
    Add warnings about stock CVS vs. the MirOS patched version.
1.39: 2016-09-06
    Fix GitLab issue #8: Exporting with commitids does not coalesce changesets.
1.38: 2016-02-28
    All Python code in the suite is 2 & 3 polyglot and 8-bit clean.
1.37: 2016-01-29
    New -c option for when you can't trust commit-IDs.
    Port patch for Sun systems.
1.36: 2015-12-22
    Avoid a core dump in another pathological case.
1.35: 2015-11-23
    Properly handle CVS masters with nonempty access lists.
    Bail out gracefully on pathological masters with no revisions.
1.34: 2015-09-25
    Another Python compatibility fix.
    Fix inconsistent license header in revdir.c.