color: give colours to the grep.inserted and grep.deleted labels
I find the "bold" makes it stand out a bit more when the green is next
to the line number.
Note that these labels are applied before the grep.change label, which
is now disabled. To get the old colour, users can restore
[color]
grep.change = green dim
to their hgrc.
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).