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This PR addresses issue #530, which suggested that creating an Overlay of HoloMaps to make it easy to declare certain datastructures. This PR reimplements the
Layout.from_values
method to be more efficient by not creating a bunch of intermediate objects, which also makes it possible to create an Overlay of HoloMaps and GridSpaces. Additionally it adds a trivialcollate
implementation which simply mirrors the oldfrom_values
implementation by reducing all the objects with the__mul__
operator. Finally it sets up Overlays of HoloMaps and GridSpaces to be automatically collated and issue a warning like we already do for other invalid nesting structures.