	modified:   thellier_gui.py => set default averaging to by site
	modified:   thellier_gui.py => set default averaging to by site

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