Add patch threshold to api and add user option #712

Job	Run time
CMake Serial Minimal Build on Linux	56s
CMake build on MacOS	35m 38s
CMake Serial With Clawpack Build on Linux	6m 35s
CMake Serial With GeoClaw Build on Linux	1m 2s
CMake Serial With CudaClaw (CUDA 10.1) Build on Linux	2m 38s
CMake Serial With CudaClaw (CUDA 11.3) Build on Linux	3m 49s
CMake MPI Minimal Build on Linux	1m 10s
CMake MPI With Clawpack Build on Linux	7m 3s
CMake MPI With GeoClaw Build on Linux	1m 41s
CMake MPI With CudaClaw (CUDA 10.1) Build on Linux	3m 50s
CMake MPI With CudaClaw (CUDA 11.3) Build on Linux	4m 45s
CMake MPI With ThunderEgg Build on Linux	3m 11s
	1h 12m 18s

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