Checkpoint/restarting of Underworld Models

This is a key feature, and its implementation so far has been problematic. We are working to improve this however.

Reported urgent checkpoint defects (with keyword "checkpoint-urgent"):

Error: Macro TramQuery(keywords~=checkpointing-urgent&type=defect) failed
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Urgent enhancements/tasks in response (with keyword "checkpoint-urgent"):

Error: Macro TramQuery(keywords~=checkpointing-urgent&type!=defect) failed
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All Checkpoint-related tickets (have "checkpoint" in their title):

Error: Macro TramQuery(summary~=checkpoint) failed
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All Checkpoint-related tickets (have "restart" in their title) (added by Wendy M):

Error: Macro TramQuery(summary~=restart) failed
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