kdesc --rewrite from the reflection klammerset; txt caption rules the block's width

Assembled from klammertext-dev e99530408517. The katom rewrite patterns
are rendered from ref/ (a table in dispatch order, patterns through @c),
the procedural listing having left mac/; a plain-text caption's rule is
as long as the table or listing it captions; the editor-support comments
name the tools' new dev/ location.

mac/katom_rewrite_rules.h

@@ -142,9 +142,3 @@ std::vector<size_t> matching_rules(const std::string& word, rewrite_order order
 // state an invariant across.
 bool category_order_holds(const std::string& word, std::string& why,
                           rewrite_order order = rewrite_order::by_category);
-
-// The "kdesc --rewrite" listing.  It moved here with the table it reads,
-// and gained the CATEGORY column -- which is the point of the categories
-// reaching the user rather than only the maintainer: a reader sees the nine
-// groups and their order instead of thirty positions.
-void describe_rewrite_patterns();