Remove PATCH method
Problem:
- Existing PATCH method uses an XML-based difference format.
- New difference formats have been proposed (DRP gdiff) which have better qualities (smaller differences)
- gdiff is not yet ready to be referenced by an IETF proposed standard
- PUT with byteranges in HTTP/1.1?
Solution:
- Remove PATCH to a separate draft, and advance once gdiff is ready.