Refs #4166. New arguments for plotMD.
Refs #4166. Fixed the problem with plotMD IPython doc pop-up.

It wasn't able to display the default value of normalization correctly
and thrown an error. I will make further investigation into why IPython
fails to do so, but this quick fix seems to solve the problem which is fine
for this ticket.
Refs #4166. Added window name parameter to helper function.

All the plotting functions were specifying it afterwards anyway.
Refs #4166. Logic for new arguments of plotMD.
Refs #4166. Some code to made plot functions consistent.

Seemed to work without it, but it feels safer this way.