The recently introduced SDF randomizer #177, part of the bigger randomization plan defined in #41, allows to randomize mostly all entries of an SDF model taking advantage of XPaths.

This is applied also to the inertia parameters that define the inertia matrix. However, sampling the parameters from a random distribution sometimes lea

We observed recently that there are situations where we want append() to overwrite existing data. At the moment, an error is raised if data is recalculated. It should be extended to allow:

• overwriting
• warning
• raise an error

It would be nice to have a handful of "standard" derived variables added to the database without the need to calculate them by hand. Initial candidates would be per capita values for final/primary energy (total), GDP, emissions, and intensities of energy/GDP, emissions/GDP, or emissions/energy. The Kaya decomposition indicators would be a good first step: https://en.wikipedia.org/wiki/Kaya_identi

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