Turn off restarting if desired

[bstabler]

Idea	Level-of-effort	Notes	Priority
Turn of restarting if desired	Hours	Add a global setting to optionally turn off restarting in order to save disk space (and some runtime) by not saving all the states of the tables in the pipeline and instead just save one version of each table This is especially useful when running lots of model scenarios in application mode.	Medium

[bstabler]

We're adding three checkpoints options:

• if True, checkpoints are written at each step
• if False, no intermediate checkpoints will be written before the end of run
• An explicit list of models to checkpoint