run-tests: add color to output if pygments is available
The output of run-tests has no formatting by default, which hampers readability.
This patch colors the diff output when pygments is available. To avoid coloring
even when pygments is available, use --color never.
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.