Bump to  Version 3.21.71
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      * Maintenance release

Date:   Mon May 6 20:15:44 2013 -0500
    About update
      * Updated list of principal developers
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Add patches: (sync to ham/fldigi/patches by joerg@)
  Avoid implicit conversions to bool for streams.
  Require C++11 for Clang and prefer std version over tr1 when in C++11
  mode.
Add comment for patches (original from cvs commit log by joerg@ thanks).