Update the package to 0.99.4nb1. All changes by John Refling.

Closes pkg/10535. Changes are:
o Bypassed the hard-to-reproduce build failure caused by
  getrusage() returning decreasing microsecond times.  Did
  this by wrapping the getrusage() function so that it never
  returns a smaller value for microseconds than the previous
  time it was called, if called within the same second.
  Perhaps this should be done to getrusage() internally, until
  fixed the proper way.  See PR bin/10201. --- refling.
o Added a tutorial and a message about it. --- refling.

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