Speed up package installations

[dvcrn]

Maybe something like this:

1. Take package list
2. If under 5, install all in parallel
3. If over 5, take 5, install parallel and repeat

Right now it installs sequentially. I tried the all parallel approach before but that didn't end so well.

[sglyon]

Would there be potential issues with co-dependencies (e.g. trying to grab linter-pep8, linter-clojure, and linter all at the same time)?

[dvcrn]

Hmm I don't think so. We just need to make sure that packages don't install other packages and all package management is done through proton.

Might be tricky but maybe we can stub package-deps out and replace it with a dummy module that does nothing.