Next steps for editable / develop proof of concept

[sbidoul (Stéphane Bidoul)]

@takluyver

I’m happy to try to make a PoC in flit - this would be about the simplest case, so it’s a good starting point to look at the question. But I’m still a bit hazy as to what exactly I should start implementing.

@takluyver you may want to try my build_wheel_for_editable POC with this pip branch.