trace proto tables if available, otherwise synthetic population (#901) #846

Job	Run time
linux-64-py3.10	8m 21s
Estimation Mode Unit Tests	16m 41s
develop-docbuild	3m 44s
macOS	6m 47s
prototype_mtc	50m 23s
win-64	12m 1s
placeholder_psrc	41m 44s
Standard 1-Zone Example (MTC)	53m 19s
random_seed_generation_test	37s
prototype_marin	1m 35s
Standard 2-Zone Example (SANDAG)	39s
prototype_mtc_extended	1h 30m 44s
placeholder_sandag	1h 46m 16s
prototype_sandag_xborder	4m 43s
production_semcog	5m 29s
prototype_mwcog	49m 48s
placeholder_multiple_zone	8m 17s
	7h 41m 8s

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