Merge pull request #74 from mkstoyanov/switch_to_cuda_native #170

Job	Run time
heffte (cmake, BUILTIN, cpu_intel)	1m 58s
heffte (cmake, FFTW, cpu_intel)	3m 7s
heffte (cmake, MKL, cpu_intel)	2m 56s
heffte (spack, BUILTIN, cpu_intel)	16m 43s
heffte (spack, FFTW, cpu_intel)	17m 8s
heffte (spack, MKL, cpu_intel)	16m 4s
heffte (cmake, ONEAPI, gpu_intel)	2m 15s
heffte (cmake, CUDA, gpu_nvidia)	7m 21s
heffte (spack, CUDA, gpu_nvidia)	19m 56s
heffte (cmake, ROCM, gpu_amd)	1m 40s
	1h 29m 8s

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