Patch against r53871

With 5 different "modules" in there, it needs to be better organized. I managed to figure it out by digging through the code, but we can't expect everyone to do that.

I've given it a shot in the attached patch. What I did:

• Explain the 5 different modes at the top, much like prop=revisions does.
• Mention that multipart/form-data is required for "file" and "chunk".
• Note that the session keys are tied to the current login session.
• Rearrange the parameters so "shared" parameters come first and then the various module-related parameters are grouped together.
• Revise parameter descriptions.
• Add more examples.

Version: 1.16.x
Severity: enhancement

Attached: