[PATCH 2 of 2] templatekw: add a {negrev} keyword

[Augie Fackler]

On Wed, Jan 17, 2018 at 10:14:30PM -0500, Jordi Gutiérrez Hermoso wrote:
> # HG changeset patch
> # User Jordi Gutiérrez Hermoso <jordigh at octave.org>
> # Date 1516243120 18000
> #      Wed Jan 17 21:38:40 2018 -0500
> # Node ID cbf1d676a938e78d40cd3504dd916f787bcb47ee
> # Parent  701f8a9defdc09bb63f2596e2fc426f2e78da313
> templatekw: add a {negrev} keyword

This is a really interesting idea. It mostly has driven me crazy that
negative revnums work, but this sort of provides a reason for their
existence I guess.

That said, I'm too wary of locking this in on the last day before a
freeze, so let's plan to discuss this after the freeze sometime in
early February? Maybe set a calendar reminder to rebase && resend this
patch then.