Add upwinding options to Richards FV local operator
Run ODE tests now with upwinding options of FV and DG solver where a change of the residual tolerance limit was not necessary. Several adjustments were made to make applying local operator options easier: * Remove 'EXPERIMENTAL_DG_FEATURES' option. Settings in config file now apply by default. * Move previously experimental options to 'richards.numerics' section. * Rename settings 'method' to 'DGMethod' and 'weights' to 'DGWeights'. * Fix typo: Rename OOB to OBB scheme (Oden, Babuska, Baumann).
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