[kde-edu]: Diff to d-ptr-ify KPlotObject

[Carsten Niehaus]

Moin

Right before sending this files I managed to rm kplotobject.cpp... Therefore 
the .cpp-diff is lost and 50% of my work as well. I am in a good mood right 
now...

Well, I am no longer motivated to port kplotobject.cpp a second time today so 
perhaps somebody takes this diff as a good starting point to d-pointer-ify 
KPlotObject

Carsten
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