Insteon: Add Milliseconds Detail to Debug Level 4 Messages

This changes the log entries which look like this:

08/04/2013 18:49:00  [Insteon_PLM] DEBUG4:

To this:

08/04/2013 18:49:00  [Insteon_PLM] DEBUG4: Milliseconds 350.83

This has made it easier to diagnose certain duplicate and corrupt message issues.