phabricator: add phabsend command to send a stack
The `phabsend` command is intended to provide `hg email`-like experience -
sending a stack, setup dependency information and do not amend existing
changesets.
It uses differential.createrawdiff and differential.revision.edit Conduit
API to create or update a Differential Revision.
Local tags like `D123` are written indicating certain changesets were sent
to Phabricator. The `phabsend` command will use obsstore and tags
information to decide whether to update or create Differential Revisions.
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.