Optimizing procedures + adding more optimized SPH example

example/Vector/7_SPH_dlb_gpu_more_opt/Makefile

example/Vector/7_SPH_dlb_gpu_more_opt/config.cfg

example/Vector/7_SPH_dlb_gpu_more_opt/main.cu

example/Vector/7_SPH_dlb_gpu_opt/main.cu

src/Vector/cuda/vector_dist_cuda_funcs.cuh

src/Vector/cuda/vector_dist_gpu_unit_tests.cu