This MR sets coordinates in SpatialPosition such that the parameter type Function can be used for MPL property and mechanical constituitive relation parameters.
Fixes the issue raised in https://discourse.opengeosys.org/t/heterogeneous-material-such-as-position-dependent-youngs-modulus/755 This MR partially fixes #3221 (closed) (someone needs to apply it to the remaining processes as well).
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