feature partitioning: add documentation #120

Job	Run time
Automake Serial Minimal Build on Linux	1m 27s
Automake Serial With Clawpack Build on Linux	1m 40s
Automake Serial With Clawpack and HDF Build on Linux	1m 43s
Automake Serial With GeoClaw Build on Linux	1m 23s
Automake Serial With CudaClaw (CUDA 10.1) Build on Linux	3m 32s
Automake Serial With CudaClaw (CUDA 11.3) Build on Linux	3m 26s
Automake MPI Minimal Build on Linux	2m 17s
Automake MPI Debug With CXX Build on Linux	3m 43s
Automake MPI With Clawpack Build on Linux	2m 26s
Automake MPI With Clawpack and HDF Build on Linux	2m 22s
Automake MPI With GeoClaw Build on Linux	1m 58s
Automake MPI With CudaClaw (CUDA 10.1) Build on Linux	3m 11s
Automake MPI With CudaClaw (CUDA 11.3) Build on Linux	3m 41s
Automake MPI With ThunderEgg Build on Linux	5m 8s
	37m 57s

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