Lots of changes to get the paragraph marking to work, and not go into
an infinite recursion.
Start to rationalize markup of method signatures; not complete.
find_all_elements(): similar to getElementsByTagName(), but operates
on the not-quite-legal fragments we deal with here.
Simplifies several individual transforms.
fixup_sectionauthors(): Convert \sectionauthor items to <author> just
after the <section>'s <title>.