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Originally from build #935

Changes

1. Handles indexed PNGs (details / cgit)
2. Rename PNG test files and add RGBA variations (To be used by TestPNGTextureFromFileNEWT, etc) (details / cgit)
3. Newt PNG test file locations (details / cgit)
4. TestPNGTextureFromFileNEWT: Use new PNG test file locations, add RGBA tests and use alpha in drawable (details / cgit)
5. PNGImage: Cleanup code and reuse scanlineRGBA buffer in indexed mode. Add DEBUG property 'jogl.debug.PNGImage' (details / cgit)