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This PR draft a proposal for switching from Newell's normal method based on global coordinates to local, i.e. from
\mathbf{n} = \sum_i P_i x P_(i+1)%nto\mathbf{n} = \sum_i (P_i - P_0) x (P_(i+1)%n - P_0).This could avoid some precision loss when dealing with large coordinates.
Tests are also more complete.