Changes to support sharrow on 2-zone model #783

Job	Run time
linux-64-py3.10	5m 44s
macOS	4m 18s
estimation_mode_test	16m 13s
prototype_mtc	42m 54s
develop-docbuild	0s
win-64	10m 29s
placeholder_psrc	38m 3s
prototype_marin	1m 35s
Standard 1-Zone Example (MTC)	4m 1s
random_seed_generation_test	2m 35s
prototype_mtc_extended	2h 18m 47s
Standard 2-Zone Example (SANDAG)	57m 35s
placeholder_sandag	1h 57m 5s
prototype_sandag_xborder	7m 55s
production_semcog	4m 52s
prototype_mwcog	43m 56s
placeholder_multiple_zone	7m 57s
	8h 23m 59s

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