[DB-SIG] Update of the DB API 2.0 Spec

[M.-A. Lemburg]

As promised, I've integrated the optional DB API extension
definition we talked about the last few months into the
DB API PEP 0249:

	http://python.sourceforge.net/peps/pep-0249.html

Feel free to adapt your database modules to these optional
additions as you see fit.

Also new in the spec text is a FAQ section. Questions which
come up often enough will be candidates for this new spec 
section.

One thing I'm still uncertain about is how to name the extensions
in the database module docs... how about "This is an optional DB 
API 2.0 extension" vs. "This is a XYZ-module specific extension 
to the DB API 2.0".

-- 
Marc-Andre Lemburg
CEO eGenix.com Software GmbH
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