Log Message:
Update to 0.21.2. Main change since 0.20.7:
  o Updated to support GTK+ 2.x
  o Added the stopwatch command.
  o added support for more processors
  o EEPROM added to 18F devices by Mike Durian
  o Added breakpoint capability on nodes
  o Added spi Module
  o Added attributes to external usart module
  o log command has been added (Command Line)
  o Profiling has been added (gui)
  o Trace viewer has been added
  o Added parport - parallel port loadable module
  o Source level debugging of C files
  o Added module attibutes (attribute.cc)
  o Enhanced module interface - now LCD module works with gpsim
  o Beautified the Single Step and Trace dump outputs
  o Added break on stack overflow and underflow
  o Added break mask to wv/rv type break points. Now you can specify
    which bits are significant.
  o Added "--cli" command line option. Invokes gpsim in command line
    mode even if it has been configured to use the gui.
  o Program viewer can now display ASCII encode text in "dt" tables
  o Added pullup/pulldown resistors to the gpsim modules
  o added "frequency" command
  o Added time field to the gui status bar.