- try to be more consistent with Va/Vt/Dv
- make the space in "... otherwise 0." non-paddable to prevent widow "0."
- consistently use -width "123456" for lists of nodes
TODO: There's still quite a bit of mess to clean up:
- tables of "n+1 level names" are indented (or not) inconsistently
- formatting of node names is inconsistent (normal vs literal)
- references to POSIX should use .St
- filesystem vs. file-system, our old time favorite!
- .Pq adds annoying extra space in troff output, do we really want to use it?
- etc.