+Move to three page views:
+ * Single page (prolly default for some backends)
+ * Continuous scrolling bug 164597
+ * Side-by-side continuous scrolling
+Make an object that handles the page count.
+Move to having three sizing types:
+ * Free zooming
+ * constrain to width
+ * constrain to height
+Sidebar improvements for ps/pixbuf, or PDF files without a TOC. bug 164811