use all TAZs when using sharrow #1107

Job	Run time
linux-64-py	6m 0s
estimation_edb_creation_test	6m 55s
Standard 1-Zone Example (MTC)	48m 43s
Standard 2-Zone Example (SANDAG)	1h 24m 24s
Estimation Notebooks Test	54m 26s
random_seed_generation_test	3m 14s
Expression Profiling Tests	7m 36s
Estimation Mode Unit Tests	25m 49s
win-64	12m 9s
prototype_sandag_xborder	6m 3s
placeholder_psrc	59m 31s
placeholder_multiple_zone	10m 43s
prototype_mtc	57m 20s
prototype_mtc_extended	1h 32m 29s
macOS	7m 41s
production_semcog	6m 52s
prototype_mwcog	56m 49s
prototype_marin	1m 59s
develop-docbuild	0s
	9h 8m 43s

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