[Simple] MSRP chunking and MIME fragmentation

[Eric Burger <eburger at brooktrout.com>]

Last I looked, MSRP is a transport protocol.  Thus, I don't understand the
normative statement in Section 6.3.1:

  "The sender MUST NOT include a completion-flag of "+" if the payload MIME
type does not support content fragmentation."

Is not the User Agent Server buffering and reconstructing messages?  That
said, if it does, we should point out in the security considerations section
that someone can say they are sending a fragmented message and then never
send anything again, holding resources forever at the UAS.

If the UAS is not buffering and reconstructing messages, and we are saying
you can only send things like "message/partial", there is no MSRP
fragmentation: MSRP only EVER sends complete MIME objects.

Given the usefulness of sending chunks as a proxy for streaming, I would
suggest just dropping the normative statement.

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