basectx: preserve loading the cached manifest in _prestatus This is just a copy from localrepo.status and is a small step to removing that method entirely. The prestatus hook is only called for changectx's, thereby ensuring that the same behavior is guaranteed.

localrepo: use new subrev method of context.py With the machinery in place, we use context.subrev instead of testing for a workingctx directly. This allows more flexibility for later patches that will add memctx to the mix.

committablectx: add subrev method to return None This allows a future patch to use object oriented style to remove an if statement in the status method.

basectx: add subrev method to return the rev of a subrepo given a subpath This will be used in an upcoming patch to simplify the status method by eliminating an if block.

merge with stable

bundle2: fix bundle2 pulling all revs on empty pulls When bundle2 was enabled, if hg pull had no commits to pull, it would print 'no changes found' and then download the entire repository from the server. This was caused by heads and common being set to None, which gets treated as heads=cl.heads() and common=[nullid], which means download the entire repo. Pulling bundles without a changegroup is a valid use case (like if we're just updating bookmarks), so this modifes the bundle code to allow not adding changegroups. This is backport of ab5040cd5749.