Summary of important user-visible changes for pkg-octave-doc 0.8.3:
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 ** The browser's find-in-page reaches the text inside a collapsed member,
    group or example panel and opens the panel on a match.  Where the
    browser does not support it the page is unchanged.

 ** Incompatible: a class page anchors its constructor after its class,
    `Class_Class`, where it was the fixed name `colapsibleConstructor`.  A
    link to a constructor on a page built before this release no longer
    resolves, and the page must be rebuilt.

 ** A source code link names the commit the documentation was built from,
    where it named the default branch, so it keeps pointing at the code the
    page describes.  The commit is named only where the file on GitHub and
    the installed file hold the same text; otherwise the branch is named as
    before.

 ** A method page's source code link lands on the line that declares the
    method, where it landed at the top of a class file that may hold dozens
    of them.  A link is anchored only where it names a commit.

 ** A class declaring its methods at the first column was documented with
    none of them, on its html page and in its `doc-cache` entries alike, and
    nothing was reported.  The declarations were searched for with a leading
    space, so one standing at the first column was invisible.

 ** An old style class reached the classdef renderer, which it left through
    an unguarded `properties` call.  What a source file declares now decides
    which route documents a name, so its constructor and its methods are
    documented as the functions `INDEX` names them.

 ** A class that failed to render was published as a plain function page
    with nothing reported, one `try` having answered both "this is not a
    class" and "this class did not render".  The class is named now and the
    build carries on.

 ** A classdef carrying a syntax error was reported as not being a classdef,
    discarding what Octave had said of it.  The reason the file gave is
    reported now, naming the line that fails.

 ** A reference to a method a class inherits was made a link to an anchor no
    page carries, and on a class rendered with method groups to a page that
    was never written.  Such a name renders as plain text now; an inherited
    property is documented and still resolves.
