First round of DRYing common render code.

[rocky]

Actually, before DRYing, I ran into a little issue here that the boxes field always only contains a single box, and calling lookup routines for "boxes" is confusing or misleading.

So before doing the DRYing, going in small steps, I think it's best to get this out of the way.

[rocky]

@mmatera: your thoughts?

[mmatera]

@mmatera: your thoughts?

If I get this right, this is just renaming. As far as I can see, I think is OK. LGTM

[rocky]

@mmatera: your thoughts?

If I get this right, this is just renaming. As far as I can see, I think is OK. LGTM

There are also some additional slight changes to mathics.core.formatter that will assist in DRYing code. And there's a redundant hard-coded character translation table removed. (The original copy should be removed or reduced as well, but that's for another time.

[mmatera]

Just a detail: these methods are called in Mathics Django and several of the Mathics3 modules. We need to adjust them accordingly.

[rocky]

Just a detail: these methods are called in Mathics Django and several of the Mathics3 modules. We need to adjust them accordingly.

Noted.