Bug#1109413: unblock: packmol/1:21.0.2-2

[Drew Parsons]

Package: release.debian.org
Followup-For: Bug #1109413

For information, with some small discussion of the bugs fixed,
the upstream PRs applied here are 

https://github.com/m3g/packmol/pull/98
https://github.com/m3g/packmol/pull/99