Convolution 3x3x3 working

src/CMakeLists.txt

src/SparseGridGpu/BlockMapGpu.hpp

src/SparseGridGpu/BlockMapGpu_kernels.cuh

src/SparseGridGpu/SparseGridGpu.hpp

src/SparseGridGpu/SparseGridGpu_ker.cuh

src/SparseGridGpu/SparseGridGpu_ker_util.hpp

src/SparseGridGpu/SparseGridGpu_kernels.cuh

src/SparseGridGpu/performance/Stencil_performance_tests.cu

src/SparseGridGpu/performance/performancePlots.hpp

src/SparseGridGpu/tests/SparseGridGpu_tests.cu

src/SparseGridGpu/tests/utils/SparseGridGpu_testKernels.cuh

src/Vector/map_vector_sparse.hpp

src/util/zmorton.hpp