From: Matthijs Kooijman <matthijs@stdin.nl>
Date: Fri, 6 Aug 2010 16:22:46 +0000 (+0200)
Subject: config: Allow specifying configuration values with no default.
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config: Allow specifying configuration values with no default.

By specifying a default of None, a config value will have no default. We
could just leave out the value alltogether, but this way even values
without a default are "documented" (this will be extended later).
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