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Workspace Method jacobianAddSurfaceQuantity
Includes a surface quantity in the Jacobian.
The quantity is specified by the GIN-variable *quantity*. The name
of the quantity must match the name used in surface_props_names.
For 1D or 2D calculations the latitude and/or longitude grid of
the retrieval field should set to have zero length.
The number of elements added to the state vector (x) is:
n_g1 * n_g2
where n_g1 and n_g2 are the length of GIN *g1* and *g2*, respectively.
Here empty vectors should be considered to have a length 1.
The elements are sorted with latitude as innermost loop and longitude
as outermost loop.
Authors: Patrick Eriksson