Sorted force now working

example/Vector/3_molecular_dynamic_gpu_opt/main.cu

openfpm_data

src/Grid/grid_dist_id_comm.hpp

src/Vector/cuda/vector_dist_cuda_func_test.cu

src/Vector/cuda/vector_dist_cuda_funcs.cuh

src/Vector/cuda/vector_dist_gpu_unit_tests.cu

src/Vector/vector_dist.hpp

src/Vector/vector_dist_comm.hpp

src/Vector/vector_dist_kernel.hpp