revlog: change _addrevision to return the new revision
The node is passed as argument already, so returning it is quite
pointless. The revision number on the other is useful as it decouples
the caller from the revlog internals.
Differential Revision: https://phab.mercurial-scm.org/D9880
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.