* unfortunately, ncurses needs to trap signals, so the last version did
  not work correctly
* now using raw mode to check for ctrl+c directly
* also moved ncurses initialization into main, instead of the
  measurement classes

* measures how many jobs with minimal runtime (1cc) can be scheduled per
  second, using a fixed number of threads
* benchmark will record at least 1-8 threads, more while performance
  increases
* also improved convergence and reduced update speed for the other
  measurements