Adding get_prop_with_grid_subset_index and overloaded \in #12
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Encapsulated get_prop_with_grid_subset_index to get a utility to select the correct vector element in a vector of properties like electrons.density.
Also overloaded \in to get simple tests like
(r, z) \in (subset, space)
to be read as "is point (r, z) inside subset of space"