[Parc-users] update for error handling in thread pool

[Pete M. <pet...@ya...>]

I made a change to the threadpool impl & the output
records task to more properly handle uncaught
exceptions during output adapter processing. Thanks
Vaibhav for reporting this error. 

The output records task was changed to catch throwable
& report it as a fatal exception (just like
processingexception, auditexception, and
transactionexception) 

The threadpoolimpl was hanging when a worker thread
exited improperly. It was waiting in the join() method
for each worker thread to mark the work complete. If
the thread exited w/ a runtime or other uncaught
exception, the flag was never flipped. It's been
changed to check for work complete OR thread death. 

These fixes only affect improperly coded output
adapters. 

-pgm

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