templates/summary: escape branch/tag/bookmark names in 'Download as zip' links to prevent XSS On a repository summary page, in the 'Download' section where you can download an archive of the repository at a given revision, the branch/tag names were not correctly escaped. This means that if an attacker is able to push a branch/tag/bookmark containing HTML/JavaScript in its name, then that code would be evaluated. This is a cross-site scripting (XSS) vulnerability. Fix the problem by correctly escaping the branch/tag/bookmarks. Reported by Bob Hogg <wombat@rwhogg.site> (thanks!).

# 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
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