This makes it possible make a graph (with for example gnuplot) of a test run and spot where most time is consumed.
Add the new code inside an "#if 0" until it's portable. 


client/mysqltest.c:
  Incorporate a patch to write a timestamp for every new line of the test that is executed.
  This makes it possible make a graph (with for example gnuplot) of a test run and spot where most time is consumed.