improve SessionContext docs, clarify threadlocal and de-emphasize threadlocal mod

pretty high on the user confusion list is whats threadlocal, why are my objects saying theyre in a session already (because they imported threadlocal without knowing what it is), whats objectstore, are sessions threadsafe, why does my code break because i put a session at the module level, etc. so we really have to make SessionContext a first class citizen and make it really clear what "threadlocal" is all about, and perhaps also make the "proxy" used by threadlocal/ActiveMapper an extra helper in the sessioncontext module.

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