GitHub doesn't understand stacked diff workflow very well.

gh is a tool that knows how to translate stacked diffs

into GitHub pull requests, in such a way that GitHub's

UI understands.

- Need a unique identifier for all patches. Where to get this

from?

- Identifiers assigned by GitHub are right out, because

we want to edit the identifier into the commit message

we send, but we can't get an identifier until we actually

perform a GitHub UI action.

- Personal identifier cached on machine? This doesn't work

if you want to use the tool from multiple machines.

- UUID? That works, if a bit wordy.

- Miniature stateful endpoint which keeps track of these for you?

- How about: username + endpoint key + number?

1. OK, you have a diff stack.

2. Assign each diff a UUID, if you haven't already

3. Create a pull request, and durably associate it with

the commit. (Amend the commit message with the

pull request)