[osg-submissions] ClipNode state sset handling

[Mathias Froehlich]

Hi Robert,

I have cleaned up the state set handling of the osg::ClipNode.
Previously the complete StateSet was cleared, even the non clipping releted 
state attributes and modes in this stateset on a call to 
setLocalSetateSetModes.
With this change only those modes/attributes are changed that need to be 
changed. That is, if a clip plane is removed from the ClipNode, only this 
assiciated mode is removed from the state set, instead of throwing away the 
whole state set.

In this way we have less surprising results if the state set of a clip node is 
used for more state than just the clip state.

This change depends on the StateSet::removaAssociatedModes change I have 
posted a few minutes ago.

The change is also based on rev 7595.

Please apply.

    Greetings

             Mathias

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