#14 Improved OSG Group helper export

[Ronny V. Vindenes]

Adding linked objects and certain helpers to a OSG Group helper, results in the hierarchy to be broken when exporting, because createGeomObjectForHelperObjects() adds a new Matrix for anything with a parent node different from the MAX root node.

I've created a crude patch to fix the issue. The memory use is less than optimal but we've been using it successfully on a large project for 3-4 months.

[Ronny V. Vindenes]

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New patch sans pointless memory allocations
File Added: osg_grouphelper-preserve-hierarchy.patch

[Ronny V. Vindenes]

OSG Group export