make it possible to remove non-standard headers (i.e., if someone has random_col they can still delete it!
make it possible to remove non-standard headers (i.e., if someone has random_col they can still delete it!

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