style cleanup


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53829 954f8c5b-7b00-dc11-b283-0030488c597c
code cleanup:
- cycles ui used 'cscene' for scene.cycles and scene.cycles_curves
- style cleanup


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53830 954f8c5b-7b00-dc11-b283-0030488c597c