Index names consistently set to "alt" for alternatives files #1103

Job	Run time
linux-64-py	6m 7s
Standard 1-Zone Example (MTC)	20m 30s
macOS	14m 47s
Estimation Notebooks Test	48m 27s
win-64	11m 43s
Standard 2-Zone Example (SANDAG)	34m 16s
random_seed_generation_test	3m 12s
Estimation Mode Unit Tests	23m 56s
estimation_edb_creation_test	7m 17s
Expression Profiling Tests	7m 32s
prototype_mtc_extended	1h 15m 9s
prototype_marin	1m 46s
prototype_mtc	55m 4s
placeholder_multiple_zone	9m 22s
prototype_mwcog	58m 58s
placeholder_psrc	55m 3s
prototype_sandag_xborder	5m 46s
production_semcog	6m 39s
develop-docbuild	0s
	7h 25m 34s

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