added segmented scan for Kepler, futher allowed to reduce shmem usage. BUt nvcc has issues with register optimiation
added segmented scan for Kepler, futher allowed to reduce shmem usage. BUt nvcc has issues with register optimiation

treecode/Bonsai,treecode/Bonsai,rioyokota/Bonsai,treecode/Bonsai,treecode/Bonsai,rioyokota/Bonsai