Coloring for "named" isotopics

[drewejohnson]

One thing that I like to do on occasion is create materials by their names rather than their ZA identifiers, e.g. U-235 vs. 92235. SERPENT lets you do this, but the coloring by this plugin (great move btw) isn't geared for that. I've attached a figure below

[gridley]

Ah, OK, this shouldn't be hard to do. It's on my TODO list now!