	modified:   pmag.py => added igrf12 coefficients to doigrf
	modified:   pmag.py => added igrf12 coefficients to doigrf

Caoimhinmg/PmagPy,Caoimhinmg/PmagPy,lfairchild/PmagPy,lfairchild/PmagPy,lfairchild/PmagPy,Caoimhinmg/PmagPy