Feature/SlabGap

Created by: elkhalia

• The Slab gap and (x,y) offsets are implemented to June Simulation
• Added driver with gap between slabs, modified cell encoding... Problem with this and segmentation, may need segmentation specific algo?..
• Added slab gap for May 2018, modified segmentation to work with the slabs, no crash digi
• Added variable slab gaps per layer
• Added variable slab gaps per layer for May