We consolidate the setup done by `rad checkout`, `rad clone` and `rad
remote add`, so that they all check for node aliases, and are all
capable of setting up tracking branches etc.
Remove this command in favor of the `git push` flow.
We also remove the `rad/patches` remote configuration which wasn't
working properly with `git fetch --all`.
This adds the ability to the git-remote-helper to open and update
patches via a `git push` to the magic ref `refs/patches` and
`refs/heads/patches/<patch-id>`.
The main change is that we had to move away from offering the `connect`
capability in the remote helper, to offering `push` and `fetch`
individually.
To get a feel for how this works, see the `rad-patch-via-push.md`
example.
Alexis Sellier
Vincenzo Palazzo