Add Manual Checkpointing#49

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FugiTech wants to merge 3 commits intotwitchscience:masterfrom

FugiTech:manual_checkpointing

Commits on Nov 25, 2019

Add WithManualCheckpointing(true) config option
FugiTech
committed

Commits on Dec 3, 2019

Error rather than give a no-op checkpointer
FugiTech
committed

Commits on Jan 25, 2021

Merge branch 'master' into manual_checkpointing
garethlewin
authored