repo_groups: extra escape of names when used in select drop-downs The lack of escaping could be a problem *if* it was possible to create repo groups with dangerous names. This was seen for example when specifying parent group of repos and repo groups. We want to keep groups_choices as HTML literals so paths can use » as separator.

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
.