Found on bunya make fails (unless nlopt disabled) due to mpi.rank #255

Job	Run time
test (d2q9, float, same, true)	5m 46s
test (d2q9, float, same, false)	5m 14s
test (d2q9, float, half, true)	5m 38s
test (d2q9, float, half-shift, true)	5m 23s
test (d2q9, float, float, true)	5m 24s
test (d2q9, float, float, false)	4m 52s
test (d2q9, float, float-shift, true)	5m 8s
test (d2q9, float, float-shift, false)	5m 21s
test (d2q9, double, same, true)	5m 26s
test (d2q9, double, same, false)	4m 51s
test (d2q9, double, half, true)	5m 9s
test (d2q9, double, half-shift, true)	5m 48s
test (d2q9, double, float, true)	5m 17s
test (d2q9, double, float, false)	6m 15s
test (d2q9, double, float-shift, true)	6m 45s
test (d2q9, double, float-shift, false)	5m 24s
test (d2q9, double, double, true)	5m 38s
test (d2q9, double, double, false)	5m 9s
	1h 38m 28s

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