Comment 16 for bug 1823367

On another note, and I meant to raise this before the horse got out of the barn, but I failed. This code adds a lot of new references to "volume" (and variations thereof) where I think, for clarity with UI decisions, we should use "call number" (and variations thereof). I am going to create a branch in that direction, but please chime in if it sounds like a bad idea. I would just rather deal with it now, before a lot of activity starts building on this, and not suffer through code/interface terminology mismatch for another entire generation of the Evergreen code.