Verbatim-safe typography, ^-punctuation quoting, full-range ^UUUU^, polyglot html

Typographic transforms (---, quote pairs, ~) no longer touch verbatim
text: @c/@code/@source_listing content and ^'...'^ spans show exactly the
characters written. "^" before any punctuation character quotes it in
every target (the apostrophe excepted: ^' opens a literal span), with the
new :resolve option on @@@target declaring per-target renderings. The
^UUUU^ code-point form accepts 4-6 hex digits, the full Unicode range.
The html output and transform spellings are polyglot (XML-valid), in
preparation for an EPUB target. New suites: transform_test, character_test
(engine), typography_test (SKS).

(from dev 07ce5ea86a0a)

doc/edit/emacs/klammertext-indent.el

@@ -133,8 +133,7 @@ same way the font-lock scanner steps over them."
                    ((and (= len 1)
                          (member name klammertext-literal-klammers))
                     ;; Verbatim interior: find the closing NAME@ by name.
-                    (if (re-search-forward
-                         (concat (regexp-quote name) "@") nil t)
+                    (if (klammertext--search-literal-close name)
                         (when (< pos (point))
                           (setq opaque t done t))
                       (setq opaque t done t)))   ; never closed