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Es gibt eine Basisklasse Norm<class DiscFuncType> mit einer rein virtuellen
Methode compute.  Konkrete Normen leiten von dieser Klasse ab und reimplementieren
compute.  Als Beispiel habe ich mal die L_2-Norm eingebaut.
Verwendet wird das ganze zum Beispiel in meinem LinearSolver.

Wie gesagt ein Prototyp.  Wer Kritik oder Anregungen hat möge sie äußern!

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for

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  grape-test as well
- add GRAPE_CXXFLAGS for passing on GL_CFLAGS
- Grape-options automatically include OpenGL-options: easier usage

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for pthreads)

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instead of __TWODIM__

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Furthermore gcc 3.4.(x) conform.

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