[Swan-commit] Changes to ref refs/heads/master

[D. Hugh Redelmeier]

New commits:
commit 54d38352f4e075554a9c21ccd8dd2ba9d0ce8560
Author: D. Hugh Redelmeier <hugh at mimosa.com>
Date:   Wed Dec 28 10:39:54 2016 -0500

    pluto: simplify add_group_instance()