I didn't see any correlation to Netger (NTGR), Negus (etc) and other forms of the same phonetics used by AFRICANS from ancient times with positive connotations. 
 I also didn't see enough emphasis placed on the effect and relationship this word has with the history of African oppression over the past few centuries.  This deserves more than a few lines. 
 I also disagree with having separate definitions for nigger and nigga.  The implications of doing that are obvious and not a good idea to anyone other than white supremacists. 
 thankyou