sharrow thread limits and cache clear script #1128

Job	Run time
linux-64-py	6m 2s
estimation_edb_creation_test	6m 45s
Estimation Mode Unit Tests	24m 25s
prototype_sandag_xborder	5m 44s
random_seed_generation_test	3m 18s
production_semcog	6m 48s
win-64	11m 18s
Expression Profiling Tests	8m 4s
prototype_mtc	55m 48s
prototype_mwcog	57m 5s
develop-docbuild	-1s
Standard 2-Zone Example (SANDAG)	11m 50s
Estimation Notebooks Test	47m 52s
prototype_mtc_extended	1h 26m 51s
macOS	11m 18s
prototype_marin	1m 57s
placeholder_psrc	57m 33s
Standard 1-Zone Example (MTC)	22m 40s
placeholder_multiple_zone	10m 36s
	7h 15m 53s

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