mention patch algebra + quilt, darcs, and pijul

[naturallymitchell]

there's a lot of prior art to walk through

mainly this video for Quilt
https://www.youtube.com/watch?v=PFxZLgGxgqE
with this screenshot

https://www.youtube.com/watch?v=hE88AR_9zIg
according to this talk, I think the difference is that Gut is "history-based" rather than "change-based", but I need to find a Haskeller who speaks English and wants to explain their point of view in under 5 minutes, preferably with a glossary, workflow diagram, and standard use case walk through

I asked pmeunier if he plans to add an interdiff library also. that should help me figure out what intersection there is between what he's doing and what I'm doing

https://jneem.github.io/pijul/
https://jneem.github.io/merging/
https://www.reddit.com/r/rust/comments/6b9tsl/merging_patches_and_pijul//