Cleanup: Removed all NODE_OPTIONS flags from C node type definitions, these are no longer required and have no effect. Whether or not a node supports additional options buttons is now determined by the
existence of a draw callback (uifunc and/or uifuncbut).

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@57113 954f8c5b-7b00-dc11-b283-0030488c597c