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

[D. Hugh Redelmeier]

New commits:
commit 8af1ed04446822dc23f253eea5e439252b304b67
Author: D. Hugh Redelmeier <hugh at mimosa.com>
Date:   Tue Oct 31 18:58:50 2017 -0400

    pluto: plutomain: improve OSX code (still wrong); improve comments