message: Allow opening a .zip file from the file open dialog
  The filers did not include zip as one of the supported options.
diff: @@ -4482,7 +4482,7 @@ void MainApp::open_trace_dialog()
  else
  {
  const char *file = noc_file_dialog_open( NOC_FILE_DIALOG_OPEN,
  - "trace-cmd files (*.dat;*.trace;*.wdat)\0*.dat;*.trace;*.wdat\0",
  + "trace-cmd files (*.dat;*.trace;*.wdat;*.zip)\0*.dat;*.trace;*.wdat;*.zip\0",
  NULL, "trace.dat" );
  if ( file && file[ 0 ] )
  