ENH: Optimized BlankGridsAtLevel
ENH: Optimized BlankGridsAtLevel

Instead of testing each cell in the grid, the algorithm now intersects
the coarsen boxes at higher level with the grid being evaluated and then
setting the cells in the intersected region as blanked

Change-Id: I52591a875f4530b05f99b5e7268a1012259d235f

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