Changes to support sharrow on 2-zone model #774

Job	Run time
linux-64-py3.10	6m 1s
prototype_mtc	47m 27s
estimation_mode_test	17m 16s
placeholder_psrc	36m 37s
develop-docbuild	0s
macOS	5m 24s
prototype_marin	2m 28s
win-64	11m 53s
prototype_mtc_extended	1h 23m 52s
Standard 1-Zone Example (MTC)	29m 12s
placeholder_sandag	1h 59m 9s
Standard 2-Zone Example (SANDAG)	31m 6s
random_seed_generation_test	3m 17s
prototype_sandag_xborder	4m 58s
production_semcog	5m 48s
prototype_mwcog	46m 4s
placeholder_multiple_zone	8m 36s
	7h 39m 8s

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