tests: tell pip not to check for a newer version
pip will check to see if it's the latest version, and complain if it isn't.
The --no-index flag implies the --disable-pip-version-check flag, and makes
the warning (and any associated network activity) go away.
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.