internal: Refactor config loading some more. * Remove fixup code in the app to make the app config class more standalone. * Remove support for old-style variants... maybe bring it back later. * Try and fix various bugs introduced by subtle config value overriding order changes.

[pytest]
norecursedirs = .* _darcs CVS .svn .git .hg *.egg-info dist build bower_components node_modules venv tmp* _cache {args}