Index names consistently set to "alt" for alternatives files #1102

Job	Run time
linux-64-py	5m 41s
random_seed_generation_test	3m 37s
Standard 1-Zone Example (MTC)	23m 29s
win-64	11m 40s
Standard 2-Zone Example (SANDAG)	36m 22s
Estimation Notebooks Test	50m 18s
macOS	7m 57s
Estimation Mode Unit Tests	25m 43s
estimation_edb_creation_test	6m 33s
Expression Profiling Tests	7m 58s
prototype_sandag_xborder	6m 16s
prototype_mtc_extended	1h 21m 59s
prototype_mtc	58m 12s
prototype_marin	1m 48s
prototype_mwcog	1h 2m 48s
placeholder_psrc	58m 54s
production_semcog	6m 36s
placeholder_multiple_zone	10m 42s
develop-docbuild	0s
	7h 46m 33s

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