[bug #61025] [me] want control of line height alteration when super-, subscripting

[G. Branden Robinson]

Follow-up Comment #2, bug #61025 (project groff):


[comment #1 comment #1:]
> I propose to add a new me(7) Boolean-valued register, $x, to enable this
behavior, and to switch it off by default.

This plan didn't quite survive contact with the enemy--the enemy being our
(groff's) `@R` macro which initializes registers, but only to zero, and also
the fact that it was the only outright _Boolean_ that we would have been
exposing via the register interface.

So $x is the amount of space by which to increase the line height instead. 
This has the advantage of parameterizing a rendering factor that a hard-coded
literal before.  (If you wanted a different adjustment, you had to redefine
the super/subscripting strings.)

For backward-compatibility purists, this approach also has the advantage of
not changing how documents render.

I'm adding `.nr $x 0` to our in-tree me(7) documents, though.

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