[PATCH 1 of 2] drawdag: update test repos by drawing the changelog DAG in ASCII

[Augie Fackler]

On Wed, Nov 09, 2016 at 07:26:03PM +0000, Jun Wu wrote:
> # HG changeset patch
> # User Jun Wu <quark at fb.com>
> # Date 1478707294 0
> #      Wed Nov 09 16:01:34 2016 +0000
> # Node ID 3f18dfc4bd9040d86cd21f24b1e8dd40ccb49558
> # Parent  e81d72b4b0ae4a4155377c36f4ae974e524a41cd
> # Available At https://bitbucket.org/quark-zju/hg-draft
> #              hg pull https://bitbucket.org/quark-zju/hg-draft -r 3f18dfc4bd90
> drawdag: update test repos by drawing the changelog DAG in ASCII

I love where this is headed just from the log message. I don't have
spare brain right now to review the code, but will do so in the next
24h if nobody else beats me to it.