add capillary -> model_eqns=2 tests #282

Job	Run time
Detect File Changes	1m 14s
Github (ubuntu, mpi, debug, true)	1h 25m 1s
Github (ubuntu, mpi, debug, false)	2h 16m 56s
Self Hosted	0s
Github (ubuntu, mpi, no-debug, true)	1h 11m 35s
Github (ubuntu, mpi, no-debug, false)	1h 50m 26s
Github (macos, mpi, debug, false)	45m 18s
Github (macos, mpi, no-debug, false)	50m 38s
Github (ubuntu, no-mpi, single, no-debug, false)	23m 13s
	8h 44m 21s

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