 - made it so spot size doesn't change when packing density is changed  - fixed bug so that occlusions hold their shape when translated, also increased z-value for occlusions so they are in front of grids
 - made it so spot size doesn't change when packing density is changed
 - fixed bug so that occlusions hold their shape when translated, also increased z-value for occlusions so they are in front of grids

ibressler/pyqtgraph