[osg-submissions] ClipPlane Unitialized Variable

[Jeremy Moles]

Attached is a version of the ClipPlane header that initializes
_clipPlaneNum to 0 before calling setClipPlaneNum() in the various
constructors. This is necessary because even though we're setting the
clipPlaneNum with the call to setClipPlanNum(), the function actually
checks the current value first, which is uninitialized.

I found this while running valgrind, and will probably be submitting a
few more the next few days.

(The diff is just for your own cursory glance)
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