Questions
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- Configuration files are hard to read / edit. Why don't you use YAML or XXML
  for config ?

  First, we need something that support nested config so we can
  not use ConfigParser. Next, we tested severals YAML packages, but they are
  really slow to import. We want xAAL stack to load as fast as possible, and
  importing big packages (like PyYAML) take around 0.5 sec on a Raspy. This
  is way too much for a simple command-line tools like xaal-info for example.
  We want to provide a better user experience.