[MLton] cvs commit: Both Time.now and Time.scan were treating microseconds as nanoseconds.

[Matthew Fluet]

> Something is wrong with this checkin.  The time.sml regression now
> fails.  And Time.{fromString,scan} are returning bizarre results.  I
> think at least Time.scan was working correctly before the checkin,
> although it may have had some poor choices for variable names.

Well, Time.now was definitely broken.  I'll undo the changes to
Time.{fromString,scan}.