GeoModelUtilities: Add a size hint to geoGetVolumes.
Add an additional optional argument to geoGetVolumes as a hint on the number of volumes to be returned. If the caller already knows this, then this can allow avoiding some vector resizes.
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Add an additional optional argument to geoGetVolumes as a hint on the number of volumes to be returned. If the caller already knows this, then this can allow avoiding some vector resizes.