Stacked Graph (written by: Georg Schleicher and Wolfgang Ludwig)
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  Requirements
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    Windows:
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    -> The program should work out of the box.
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    GNU/Linux:
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    -> The library Qt4 has to be installed.
    -> For the OpenGL options the Qt4 OpenGL library has to be installed.
    
    To install these libraries, use the software installation tool of your GNU/Linux distribution.
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  Troubleshooting
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    The "Auto OpenGL" and "OpenGL" option are grayed out:
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    -> This can mean that OpenGL is not installed or supported by your hardware.
       It can also mean that your hardware does not support OpenGL samplebuffers.
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    Only the "OpenGL" option is grayed out:
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    -> This is because "Auto OpenGL" is active.
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