Fix the alignment of three short tables which use 'key dash meaning'
so that the dashes line up using Keni's .PS/.PL/.PE macros. (There
might be others that need this.)
Center the "- - - -" separator which precedes the list of dungeoneers
at the end. (Thinking about it now, possibly it should be forced to
have zero paragraph indentation prior to centering rather than tacking
on some trailing spaces to shift the non-blank part to the left. The
title for the table of display symbols might be in the same boat here.
But I'm roff'd out for the time being.)
Try to explain object filtering for commands that can take multiple
object classes combined with multiple BUCX states (and/or 'unpaid').
At the moment it is attached to the 'D' command where it is most
likely to be used, but probably ought to have its own subsection in
the Objects chapter so that it doesn't bog down the command list.
The filtering paragraph ought to be duplicated in Guidebook.tex, but
there's enough quoting going on that I didn't trust myself to attempt
an untested change.