The Debian package of propellor ships its full source code because
propellor is configured by rebuilding it, and embraces modification of any
of the source code.
/usr/bin/propellor is a wrapper which will set up a propellor git
repository in ~/.propellor/, and run ~/.propellor/propellor if it exists.
Edit ~/.propellor/config.hs to configure it.
Note that upgrading the propellor package will not update your
~/.propellor/ repository. You can `git pull upstream` in your repository to
update to the current upstream.
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