Have manage.py load up enabled extensions and include them in INSTALLED_APPS cache

Review Request #1640 — Created June 6, 2010 and submitted — Latest diff uploaded

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Review Board
extensions

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Commands from manage.py, like syncdb or evolve, didn't originally consider extension applications during processing.

This patch will load up all enabled extensions, and add them to the INSTALLED_APPS cache.
Manual.  Seems to work alright.  Spews out some logging and deprecation warnings though:

http://www.pastie.org/994050