Summary of important user-visible changes for pkg-octave-doc 0.7.6:
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 ** New function `package_texi2qch` builds a package's Qt compressed help
    file, which Octave's GUI reads to populate its documentation tab.  `pkg
    load` registers `doc/<pkgname>.qch` from the package's installation
    directory and `pkg unload` unregisters it, so the generated file has to
    be placed there before the release tarball is built.

 ** The help text of every function listed in a package's INDEX file is
    rendered to one page per category, and that of every classdef method and
    property to a page tree belonging to the class: the class help text, its
    properties, and its methods, the last split into one page per group for a
    classdef that sorts its methods under `** Group Name **` banners.  A class
    nests under the category its INDEX entry puts it in.

 ** Demos are not included, neither their code nor their figures.  The
    resulting file is 1.05 MB for `statistics` and 0.29 MB for `datatypes`.

 ** `package_texi2qch` requires the `qhelpgenerator` program of the Qt
    toolkit.  It is looked up before any page is rendered, and an error is
    raised if it cannot be found.  Name it with the `'Generator'` option on a
    system carrying more than one Qt version.
