changegroup: reintroduce some comments that have gotten lost over the years
I got concerned about the correctness of the pruning logic, but I was
misreading it. I didn't figure that out until I walked all the way
back to 0252abaafb8a from 20111, where I was finally able to see (in
the deleted side of the change!) a complete explanation from
b6d9ea0bc107 in 2005.
Differential Revision: https://phab.mercurial-scm.org/D4686
changegroup: tease out a temporary prune method for manifests
It's extracted so extensions can filter manifest nodes if needed. This
is an unfortunate hack, but I think I only need it for manifests. The
long-term solution will be to rework the relationship between
changegroups and storage so that this isn't required.
Differential Revision: https://phab.mercurial-scm.org/D4685