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Fix all PEP8 errors but E221 (multiple spaces before operator).

Instead of depending on config.py defining several magic variables,
move the default configuration in the config instance at the root of
the lib module, and make config.py override them as needed.

Create a directory "lib/", put the checks there. Move the compat file
there too.
Also put the config in a separate file so that users may edit without
messing up the core. Would also ease intallation so that config
may land in etc/ for example.