upgrade: rename 'removecldeltachain' to 'plain-cl-delta'
The new naming is more descriptive of a "state" while the older one was more
about "action". I'm looking into command exposing more of data about the state
of the repository so "state" oriented work better there.
The key has not been made public anywhere outside the debug area so it is fine
to update it.
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.