[PATCH 5 of 5] template: add successors template

[Augie Fackler]

On Wed, Jul 05, 2017 at 10:53:58PM +0200, Boris Feld wrote:
> # HG changeset patch
> # User Boris Feld <boris.feld at octobus.net>
> # Date 1499073720 -7200
> #      Mon Jul 03 11:22:00 2017 +0200
> # Node ID 82e2b4eb96b573dde890d725d758dbbc49407133
> # Parent  870bfaafd90e030b85b869922050be98f000a9a9
> # EXP-Topic successorstemplate
> template: add successors template

queued, thanks

>
> Add a 'successorssets' template that returns the list of all closest known
> sucessorssets for a changectx. The elements of the list are changesets.

I'm not...super in love with the name successorssets, but I have no
better ideas. I'd welcome some bikeshedding in the next ten days.