Changes to support sharrow on 2-zone model #766

Job	Run time
linux-64-py3.10	5m 9s
estimation_mode_test	16m 22s
prototype_mtc	43m 30s
develop-docbuild	0s
macOS	8m 24s
placeholder_psrc	34m 34s
prototype_mtc	44m 5s
win-64	9m 30s
prototype_marin	1m 35s
random_seed_generation_test	2m 32s
prototype_psrc_in_development	3m 35s
prototype_mtc_extended	2h 20m 33s
placeholder_sandag	1h 54m 45s
prototype_sandag_xborder	4m 9s
production_semcog	5m 5s
prototype_mwcog	42m 24s
placeholder_multiple_zone	7m 45s
	8h 3m 57s

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