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Extending the gridshift operations into the fourth dimension. The idea is to be able to use the grid shift operations as step functions when making transformations in areas subject to deformation after seismic events. This is useful when transforming coordinate from one epoch to another, e.g. in dynamic reference frames. This work is closely related to the proposed deformation model grid format in #1001.
I will expand the docs later to today, for now I am just checking that the code builds properly.