broke out Server module
clean up Propellr.CmdLine exports
fix haddock filename display
typo
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merge from git-annex
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prevent multiple concurrent provisioning inside docker container

Lock a lock file while provisioning inside, otherwise propellor could be
running to init the container when the system has just booted, or the
container was just started from being stopped, and at the same time,
propellor run outside the container chains into it to provision.

Previously, simplesh prevented this in a different way.
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