Log Message:
Update to 3.13

Changelog:
3.13 @ 2013-12-11
  Terminal release of this code - the branch and tag analysis is just not
  good enough on anything other than a linear repository. Use cvs-fast-export
  instead.

3.12 @ 2013-12-10
  Warning: execute permissions on CVS files are not reported!
  The command-line argument can now be a CVS URL.
  The --summary-first option was removed to simplify the code's control flow.
  The -g and --diff-opts options have been removed to simplify dependencies.
  Deprecation warning for -s, -a, -f, -l, -n, -p, --root, --diff-opts, and -t.

3.11 @ 2013-12-09
  Eliminate dodgy tmpnam() use.
  Make the documentation truthful about --convert-ignores.