+ * * all the measurements in `conf' should be configurable
+ * + notably paper size/shape
+ * * page header and footer should be configurable; we should
+ * be able to shift the page number elsewhere, and add other
+ * things such as the current chapter/section title and fixed
+ * text
+ * * remove the fixed mapping from heading levels to heading
+ * styles; offer a menu of styles from which the user can
+ * choose at every heading level
+ * * first-line indent in paragraphs
+ * * fixed text: `Contents', `Index', bullet, quotes, the
+ * colon-space and full stop in chapter title constructions
+ * * configurable location of contents?
+ * * certainly configurably _remove_ the contents, and possibly
+ * also the index
+ * * double-sided document switch?
+ * + means you have two header/footer formats which
+ * alternate
+ * + and means that mandatory page breaks before chapter
+ * titles should include a blank page if necessary to
+ * start the next section to a right-hand page