add drop_unused_columns to compute_settings #153

Job	Run time
linux-64-py3.10	4m 49s
estimation_mode_test	16m 1s
macOS	14m 20s
win-64	10m 1s
prototype_mtc	42m 31s
develop-docbuild	0s
placeholder_psrc	35m 41s
prototype_marin	1m 32s
prototype_mtc	44m 44s
random_seed_generation_test	2m 17s
prototype_mtc_extended	2h 13m 37s
prototype_psrc_in_development	3m 35s
placeholder_sandag	1h 52m 58s
prototype_sandag_xborder	4m 7s
production_semcog	4m 57s
prototype_mwcog	43m 37s
placeholder_multiple_zone	7m 33s
	8h 2m 20s

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