Add option to not run simulations when converting snapshots #129

Job	Run time
bump-dev-version	0s
update-core-files / update-core-files	1m 1s
R-CMD-Check / windows-latest (release)	3m 17s
test-coverage / test-coverage	4m 27s
R-CMD-Check / ubuntu-latest (release)	4m 40s
pkgdown / pkgdown	4m 49s
	18m 14s

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