Feature request: hg command to easily install extensions

[Manuel Jacob]

On 13/12/2022 10.58, Georges Racinet wrote:
> Since hg-evolve 9.3.0 (topic 0.18.0), it's been possible for the server 
> to send changesets with topics only to clients having the topic 
> extension (look for `topic.server-gate-topic-changesets` in `hg help -e 
> topic`).
> 
> Even `hg pull -r <hash>` won't fetch the changeset in that case.

I couldn’t confirm this on my client and foss.heptapod.net. Pulling 
without specifying specific changesets didn’t pull topics, but I was 
able to pull topics when specifying the hash of the changeset.

> In particular, Heptapod uses this setting.