integer encoding vehicle allocation spec (#877) #787

Job	Run time
linux-64-py3.10	5m 41s
estimation_mode_test	16m 15s
develop-docbuild	3m 48s
macOS	4m 24s
prototype_mtc	43m 20s
win-64	11m 7s
placeholder_psrc	35m 9s
random_seed_generation_test	2m 40s
Standard 1-Zone Example (MTC)	4m 7s
prototype_marin	1m 29s
Standard 2-Zone Example (SANDAG)	58m 42s
prototype_mtc_extended	2h 21m 48s
placeholder_sandag	1h 58m 59s
prototype_sandag_xborder	4m 26s
production_semcog	5m 11s
prototype_mwcog	42m 41s
placeholder_multiple_zone	7m 54s
	8h 27m 41s

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