Adding code for enforcing start and end times for test, if something went wrong with auto date times, etc. Also a little refactoring.
Disabling a noisy warning for now at least. Added or removed some comments.
Adding script perf stats in last INFO output. Renamed some other timing vars to avoid confusion.
Adds nr of lines saved (out of tot lines in log file) to the performance log.
Improved perf logging by skipping files with no lines saved (not very interesting to measure speed of 'nothing'). Also improved some INFO output texts.