Add executable to local .gitignore
Better thread block size for subtractPSF kernel
Optimized findPeak using CUB reduction and optimized block size for subtractPSF
Remove hard coded number of blocks, now based on #SMs. Also remove extraneous device syncs.
Eliminated unnecessary device copy of dirty input image, and replaced host memcpy of dirty->residual with H2D copy. Two birds, one parallel stone.
Added __restrict__ to const pointer arguments
Moved CUB reduction into d_findPeak for simplicity.