*** ogplot ***
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30.07.08
- non-root isn't allowed to rtai_malloc() large amount of 
  memory (1 MB), revert to root
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28.07.08
- allow non-root
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13.07.07
- ogplot command options
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27.03.07
- change background to white, font color to black
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02.03.06
- bug fix: plot IDither as well, doplotPDP()
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01.03.06
- carrier / code frequency increment options 'CarDFrq', 'CodDFrq'
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08.06.04
- added options 'Id', 'Qp', 'Qd'
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10.12.03
- added plotting of C/A code correlation (started)
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09.12.03
- ported Stephan Esterhuizen's code to OpenGPSrec
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