Release 2017.01.27

• Reduce the number of exceptions seen when a thread exits with an exception - There were multiple exceptions being displayed that were the result of killing the other threads.
• Change how the overall progress reporting and exception handling is managed, to minimize the thread overhead burden.
• Allow the user to specify a number of tasks on the command line using "-tasks n", and modify the default calculation. The previous default had a hard-coded limit of 64, and multiplied the number of threads by 10; new default removes the hard-coded limit, and multiplies by only 3.
• Change the output behavior - by default, the per-thread status messages will no longer be output. Per-thread status messages are a large amount of output, and aren't usually necessary with good progress reporting. The old output can be re-enabled using the command line argument "-verbose 1"
• Add the elapsed time to the overall progress report
• Fix the overall progress reporting - get the active task progress again with the overall task progress.