- Add a horrible bit of code to detect tsc differences between processors.

   This only works if there is no significant drift and all processors are
   running at the same frequency.  Fortunately, schedgraph traces on MP
   machines tend to cover less than a second so drift shouldn't be an issue.
 - KTRFile::synchstamp() iterates once over the whole list to determine the
   lowest tsc value and syncs adjusts all other values to match.  We assume
   that the first tick recorded on all cpus happened at the same instant to
   start with.
 - KTRFile::monostamp() iterates again over the whole file and checks for
   a cpu agnostic monotonically increasing clock.  If the time ever goes
   backwards the cpu responsible is adjusted further to fit.  This will
   make the possible incorrect delta between cpus as small as the shortest
   time between two events.  This time can be fairly large due to sched_lock
   essentially protecting all events.
 - KTRFile::checkstamp() now returns an adjusted timestamp.
 - StateEvent::draw() detects states that occur out of order in time and
   draws them as 0 pixels after printing a warning.

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