* Now uses only OpenGL2 draw buffers instead of relying on GL_ARB_draw_buffers existing * copyFrameBuffer() was non-functional when used against the main framebuffer because the width/height were set to zero erroneously, now it uses the current viewport parameters. * Added TestRenderToCubemap to demonstrate render to cubemap functionality, it also uses MRT to render to all the cube sides git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9378 75d07b2b-3a1a-0410-a2c5-0572b91ccdca