o Add "placebo" timer which does nothing. Useful for assessing timer
  overhead
o Rewrote GPTLpr_summary() from scratch for scalability, and compute mean,
  std. dev.
o Added GPTLmaxthreads option to GPTLsetoption() to provide user
  settability of maximum number of threads.
  - changed the default for THREADED_PTHREADS from 256 to 64.x
o Made estimate of GPTL memory usage more accurate.
o Removed unused function num_descendants
o Bugfix for setting the default print method from Fortran namelist.
o Updated web pages and man pages where appropriate.