add ptq purge and support ptq status for SQS
adds mv command to ptq CLI tool
adds cp command to ptq
more robust is_empty and iter for FileQueue
More robust test for queueuable function args.
ensure green threads throw exceptions correctly
Fixes FileQueue.is_empty.
upload numpy objects to SQS + fixes segfault on Mac
smoother parallel upload progress bar + fixes
Fix for sqs.