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This improves the summary output. It's mainly a code refactoring in order to allow to output something else than text. For the moment, only console output is supported, but it's straightforward to implement other type of output (json, xml, or whatever).
I've also changed the way uncertainties and efficiencies are computed (see #28). Uncertainty is now only statistical, and efficiencies (and related errors) are computed using a Bayesian method. It's probably not correct when there's negative weight, but at least it's more correct than the previous method 😄