improve formatting of ipmag module
improve formatting of ipmag module

and make it so that ‘import matplotlib.pyplot as pyplot’ is replace
with ‘import matplotlib.pyplot as plt’ for consistency with other
scientific computing projects

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