Tutte Code Version 0.9.15
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The following updates have been made:

* For the "--chromatic" option, the tool now automatically removes
  multi-edges on the input graph.  Thanks to Alan Sokal for pointing
  out this bug.

* For the "--chromatic" option, the tool now reports the result as
  zero if the input graph contains a loop, and outputs an error
  message as well.

* For the "--cache-stats" option, a bug was fixed for large graphs
  which caused arithmetic overflow of the counters.  Thanks to Gary
  for pointing out this bug.

* Added "--stdin" option to allow reading graphs from stdin, rather
  than a file.