Add and modify draw functions
Add and modify draw functions

Add draw_coeff function to generate plots of influence
coefficients. Add draw_strains to plot different strain fields from a
FE simulation. Change draw_strain to draw_strain_compare to compare
the difference in strain fields between FE and MKS.

davidbrough1/pymks,XinyiGong/pymks,awhite40/pymks,fredhohman/pymks,davidbrough1/pymks