merge: make hg.merge() take a context instead of a node...
merge: make hg.merge() take a context instead of a node
Many callers already have a repo, so we might as well pass
that. `merge.update()` will look up the context object later. This
patch is part of making it so we pass around the context object all
the way down instead.
I also removed the `repo` argument since it can be retrieved from the
context.
Differential Revision:
https://phab.mercurial-scm.org/D7999
