remove dependency links from setup.py

[ra-tolson]

Stop relying on dependency links in setup.py as this (apparent) misfeature won't be supported by pip --process-dependency-links indefinitely.

[ircwaves]

There's a bit of confusion around this, but the most recent information that I have regarding --process-dependency-links is here:
pypa/pip#4187

[ra-tolson]

My mistake: It's an apparent misfeature in setuptools but only deprecated in pip; I've edited the top comment accordingly.

I say 'apparent misfeature' because this guy thinks so, and he's evidently a significant contributor to the python packaging landscape; here's the blog post I found earlier and put into another of our packaging issues:

https://caremad.io/posts/2013/07/setup-vs-requirement/ <-- section "A Setuptools Misfeature"

The author of that, by amazing coincidence, wrote the relevant comment here:

pypa/pip#1955 (comment)

That issue, 1955, is the one linked by pypa/pip#4187! 😲

[ircwaves]

We will only continue to use this misfeature until gippy 0.3.x is updated at the cheese shop OR we migrate to gippy 1.x.