Updated the documentation of SQLAlchemy, since the declarative interface is now used by default. Also introduced minor enhancements.
Updated the documentation of SQLAlchemy, since the declarative interface is now used by default. Also introduced minor enhancements.

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extra : convert_revision : svn%3A77541ad4-5f01-0410-9ede-a1b63cd9a898/trunk%405170

lucius-feng/tg2,lucius-feng/tg2