* level 42 activates a sweep search that iterates over
    - clock periods 0.5 - 5 (0.125 steps)
    - optimization levels 3 - 0
* it also logs the runtimes of each step and outputs them in a
  synthesis_runtimes.tsv file
* resulting WNS is logged in synthesis_results.tsv for each step
* useful for analysis of evaluation runs
* careful - regular evaluation is currently broken by the changes