remove pylab import from ipmagplotlib replace with matplotlib.pyplot and specific numpy imports
remove pylab import from ipmagplotlib replace with matplotlib.pyplot and specific numpy imports

pylab is being deprecated and is a big import for this module given
that the functions are largely just using matplotlib.pyplot along with
two numpy functions

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