- Add new option "stat" to display statistic about the evolution between
WR and Unix time
- When we set the WR time with the current UNIX time, the driver
wr_clocksource must be removed first and then reinstalled when the time
is set. If it is not done, the WR and Unix time are not well
synchronized.
- When the WR time is set, the sec and ns and set in one call. We don't
need to call twice the wr_date tool.