[wsrp][wsia][wsrp-wsia joint interfaces][Draft Spec 0.44]

As requested on Tuesday, here is a modified version of the Draft Spec that
reflects having orthogonal concepts of "sessions" and "entities" carried
throughout the API. Thomas has inserted a few initial comments from a WSRP
perspective (in particular, potential answers to some of the open questions
in the Note blocks).

(See attached file: WSIA-WSRP Joint Spec Draft 0.44.doc)