Summary of important user-visible changes for pkg-octave-doc 0.8.4:
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 ** A cross-reference to a function or class the package documents
    (`@seealso`, `@xref`, `@ref`, `@pxref`) links to its page again.  Since
    0.8.2, `package_texi2html` linked every such name to a garbled form of its
    source code URL, which resolves to nothing, so documentation built with
    0.8.2 or 0.8.3 wants a rebuild.

 ** Building a `doc-cache` with `package_texi2cache`, `folder_texi2cache` or
    `classdef_texi2cache` no longer breaks the first demo of a class
    documented later in the same session, which failed to find the class's
    private functions.
