routing: separate url handling from routing - move it to webutils This is a helper method relying on the thread local tg.request. We didn't have a good place to put it. Now we do. This (re)moves unfortunate dependencies to the routing module (which almost is a controller).

# 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
.