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Closes #4575
This PR also:
os.access
--global
flag, which closes Add an explicit --global installation option #4865I'm open to the idea of breaking this PR up but I think these changes are intertwined enough that we should consider them all in one bundle.
Since this is a topic that probably needs some discussion, I feel it'd be best to only discuss implementation related stuff here and have all the higher level discussion over at #4575.
I still need to make this refuse to install stuff in different schemes, write tests and documentation and probably more stuff. I'd appreciate some more eyeballs passing through this code though now.
TODO + self-notes