Summary of important user-visible changes for datatypes 1.3.4:
--------------------------------------------------------------

 This release ships the package's Qt help file, so that its documentation is
 available in the Documentation tab of Octave's GUI, and documents the one
 method that carried no help text.

 ** The package ships `doc/datatypes.qch`, which `pkg load` registers with
    Octave's GUI and `pkg unload` unregisters.  The Documentation tab lists
    every function of the INDEX under its category, and every classdef under
    the category its INDEX entry puts it in, carrying the class help text, its
    properties, and its methods under a page per method group.  The file is
    built by `package_texi2qch` of the `pkg-octave-doc` package and holds no
    demos.

 ** `duration.rdivide` is documented.  The method carried no help text at all,
    so `help duration.rdivide` answered "undocumented method" where every
    other public method of the class answers with its texinfo.
