- BatchNode can now batch a scene graph with several materials. It creates a batch by material
- Added a SimpleBatchNode that batch only geometries (no sub node graph) for better performances
- removed RF_REFRESHBATCH from Spatial as it's no longer needed
- changed test cases a bit
git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8527 75d07b2b-3a1a-0410-a2c5-0572b91ccdca
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