Add patch threshold to api and add user option #420

Job	Run time
Automake Serial Minimal Build on Linux	1m 30s
Automake Serial With Clawpack Build on Linux	17m 15s
Automake Serial With GeoClaw Build on Linux	1m 49s
Automake Serial With CudaClaw (CUDA 10.1) Build on Linux	3m 28s
Automake Serial With CudaClaw (CUDA 11.3) Build on Linux	3m 11s
Automake MPI Minimal Build on Linux	2m 9s
Automake MPI Debug With CXX Build on Linux	5m 24s
Automake MPI With Clawpack Build on Linux	16m 53s
Automake MPI With GeoClaw Build on Linux	2m 24s
Automake MPI With CudaClaw (CUDA 10.1) Build on Linux	3m 56s
Automake MPI With CudaClaw (CUDA 11.3) Build on Linux	3m 34s
Automake MPI With ThunderEgg Build on Linux	5m 20s
	1h 6m 53s

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