/**
  \example zformat2.cpp 

  This sketch uses 'custom Z handlers' to print and scan formatted 2D
  coordinates within single ::facePrintf and ::packetScanf function
  calls.  It defines a struct of two short ints, but the technique
  applies to any struct or class.

  Sending this sketch a packet like this: <pre>n(1,-2)
  </pre> 
  produces this response:<pre>n(-1,2)
  </pre>
  while a packet like
  this:<pre>n(1,2]
  </pre>produces an output like: <pre>Ln 25.449 Failed at 6
  </pre>

 */
