Part one of thickness reservoirs #398

Job	Run time
build-coupled-api	2m 39s
build-symmetric	9m 8s
build-opt-target	5m 25s
build-opt	6m 15s
build-repro	5m 18s
build-openmp	2m 42s
build-asymmetric	9m 26s
build-target	4m 24s
check-style-and-docstrings	4m 7s
build-coverage	2m 53s
run-coverage	2m 1s
compare-timings	6m 9s
run-timings	0s
test-rotate	3m 58s
test-layout	4m 1s
test-restart	3m 24s
test-openmp	2m 20s
test-repro	2m 48s
test-dim (l, horizontal length)	2m 9s
test-dim (q, enthalpy)	2m 14s
test-regression	2m 4s
test-dim (t, time)	2m 7s
test-dim (h, vertical thickness)	2m 19s
test-dim (r, density)	2m 5s
test-dim (z, vertical coordinate)	10m 12s
test-nan	3m 20s
test-grid	2m 18s
cleanup-common	6s
cleanup-pr	3s
cleanup-push	0s
	1h 45m 55s

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