Fixing general interface

src/Grid/grid_sm.hpp

src/NN/CellList/CellList_gpu_test.cu

src/NN/CellList/cuda/CellList_gpu.hpp

src/NN/CellList/cuda/CellList_gpu_ker.cuh

src/Vector/map_vector_std.hpp

src/util/cuda/scan_cuda.cuh

src/util/cuda/scan_cuda_unit_tests.cu