$ java -Djdk.nio.file.WatchService.maxEventsPerPoll=10000 WatchDemo   (scenario 6 only)
6. burst: create N empty files in a fresh directory before polling once (jdk.nio.file.WatchService.maxEventsPerPoll=10000):
    N=100   delivered 100  events: ENTRY_CREATE=100  OVERFLOW(count)=0, files on disk=100
    N=512   delivered 512  events: ENTRY_CREATE=512  OVERFLOW(count)=0, files on disk=512
    N=513   delivered 513  events: ENTRY_CREATE=513  OVERFLOW(count)=0, files on disk=513
    N=5000  delivered 5000 events: ENTRY_CREATE=5000 OVERFLOW(count)=0, files on disk=5000

Scenario 3 (50 appends, no polling) over five more runs:
    {(batches)=1, ENTRY_MODIFY=21}
    {(batches)=1, ENTRY_MODIFY=20}
    {(batches)=1, ENTRY_MODIFY=2}
    {(batches)=1, ENTRY_MODIFY=1}
    {(batches)=1, ENTRY_MODIFY=19}