For example, a syntactic form box is labeled with "SYNTAX". Forms
such as `defform' and `defthing' now support a `#:kind' option
for setting the label.
Looks like it's not making any changes in the current tests (which use
the text renderer), but with words that are longer than the width the
old version would stop wrapping afetr these words. Added a test file
that fails with that and succeeds with the new one. If anyone cares
about this, it's easy to make hyphenate words that are too long for a
line.
(Also fixed some redundant frustration in the bib test...)
