Changes to support sharrow on 2-zone model #779

Job	Run time
linux-64-py3.10	5m 50s
estimation_mode_test	16m 21s
develop-docbuild	0s
prototype_mtc	44m 40s
macOS	5m 13s
Standard 1-Zone Example (MTC)	50m 36s
placeholder_psrc	36m 57s
win-64	11m 45s
random_seed_generation_test	2m 51s
Standard 2-Zone Example (SANDAG)	41m 4s
prototype_marin	2m 29s
prototype_mtc_extended	2h 17m 1s
placeholder_sandag	2h 7m 20s
prototype_sandag_xborder	4m 19s
production_semcog	5m 53s
prototype_mwcog	43m 48s
placeholder_multiple_zone	8m 31s
	9h 4m 38s

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