hg: fix next() and prev() for obsolete changesets If using evolve, the revision number is not longer the same as the (visible) number of changesets. When you clicked the next or prev button on the files page, simply nothing happened. At the first click the files list got reloaded, but after that nothing happened.

# 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
.