Human-friendly event-log printer

...textual presentation of event-log content useful for debugging, since
sometimes things aren't entirely obvious when looking at them in a hex
dump.
Fix input field conflation in csv convert

Instead of writing out the run time captured from the CSV input, the
CSV-to-binary-log converter had been affected by a defect in which it
wrote a second copy of the event ID instead. This fixes that.
Fix argument order for calls to NewScatter()

The start and end time arguments were reversed from proper order as
called from the CLI and server, causing the graph to fail to render
properly.