Add dry-run option#129

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Neal910 wants to merge 5 commits intopluff:masterfrom

Commits on Aug 27, 2020

prototype commit
Feng Sha
committed

Commits on Sep 16, 2020

WIP
Feng Sha
committed
remove testing code
Feng Sha
committed

Commits on Jun 22, 2021

crystalball changes
Feng Sha
committed
Merge branch 'crystalball-research' into 'master'
Feng Sha
committed