modernize (benchmark-suite lib)

modernize (benchmark-suite lib)

* benchmark-suite/benchmark-suite/lib.scm: Rewrite to be more modern,
  using parameters, records, and higher precision timers.  Since this
  file was never installed, this is an acceptable interface change.
  (run-benchmark): Run the thunk once before going into the benchmark.
  Adapt to new `report' interface.
  (report): Change to expect only one argument, a <benchmark-result>
  object.
  (print-result): Adapt.  The result is in the same format as before.
  (print-user-result): Adapt.  The result is different from before, but
  as this is just printed on stdout and not logged, there should be no
  problem.
  (calibrate-benchmark-framework): Pull initialization into a function.