BF + DOC: Cleaning up some old cruft and adding documentation for RESTORE.
BF + DOC: Cleaning up some old cruft and adding documentation for RESTORE.

Also, py3k compatibility for the dti module.

StongeEtienne/dipy,maurozucchelli/dipy,matthieudumont/dipy,maurozucchelli/dipy,StongeEtienne/dipy,rfdougherty/dipy,villalonreina/dipy,oesteban/dipy,rfdougherty/dipy,Messaoud-Boudjada/dipy,jyeatman/dipy,jyeatman/dipy,beni55/dipy,FrancoisRheaultUS/dipy,nilgoyyou/dipy,villalonreina/dipy,oesteban/dipy,beni55/dipy,mdesco/dipy,sinkpoint/dipy,mdesco/dipy,samuelstjean/dipy,maurozucchelli/dipy,samuelstjean/dipy,matthieudumont/dipy,demianw/dipy,sinkpoint/dipy,JohnGriffiths/dipy,JohnGriffiths/dipy,nilgoyyou/dipy,Messaoud-Boudjada/dipy,demianw/dipy,samuelstjean/dipy,FrancoisRheaultUS/dipy