Again, title says it all. :D
Removed the stars feature as discussed at the Blender conference 2013 (dev meeting), and in previous years.
The method works for simple cases only and even a code comment said "old stars feature, go away".
I hope I didn't forget anything here, but couldn't find more occurrences of stars inside the code.
Edit: Forgot the WO_STAR_ defines in DNA_ipo_types.h, would add a comment there.