adding back code related to RF calibration
adding back code related to RF calibration

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