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WIP: Add handler for USR1 signal that attempts to dump the active tasks and memory…

Peter W. Draper requested to merge signal-handler-dump into master

Add handler for USR1 signal that attempts to dump the active tasks and memory logger (if enabled) and exits the applications

Attempt to provide some useful information about internal state when deadlocked.

Signaling a SLURM batch job using scancel -s USR1 <jobid> works (but not reliably)

See !859 (merged) for a more reliable solution.

Edited by Peter W. Draper

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