Support for _d3 and _d4 diagnostics #7

Job	Run time
build-asymmetric	3m 11s
build-repro	3m 43s
build-symmetric	3m 47s
build-openmp	4m 39s
build-target	0s
test-grid	2m 11s
test-restart	2m 13s
test-nan	2m 1s
test-repro	1m 35s
test-layout	1m 16s
test-rotate	2m 1s
test-dim (h, vertical thickness)	2m 25s
test-dim (z, vertical coordinate)	1m 41s
test-dim (t, time)	1m 55s
test-dim (q, enthalpy)	2m 7s
test-dim (l, horizontal length)	2m 17s
test-dim (r, density)	2m 11s
test-regression	0s
test-openmp	2m 50s
cleanup-common	7s
cleanup-push	0s
cleanup-pr	-1s
	42m 9s

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