The V font is defined conditionally, so that it renders
like CB in output formats that support that, and like B
in those that don't (e.g. the terminal).
We could just redefine C, but this would affect code
blocks, too, and putting them all in boldface looks ugly,
I think.
Possible drawback: fragments created by pandoc's man
writer will presuppose a nonstandard V font.
Closes#7506.
Supersedes 253467a549.
Closes#7506.
This also allows us to get rid of some special casing
on definition lists that ensured that options in code
spans would be boldface. (If this change is ever reverted,
we'll need that again.)
Now we boldface code but not other things. This matches the
most common style in man pages (particularly option lists).
Also, remove a regression in the last commit in which 'nowrap'
was removed.
