Summary of important user-visible changes for pkg-octave-doc 0.7.5:
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 ** Demos are found for functions inside a `+namespace` directory.  They are
    retrieved through `test`, which locates a file with `file_in_loadpath`,
    and that does not resolve a name such as `geom.offset`.  No error was
    raised, so a namespaced package was documented without any of its demos.

 ** Demo figure titles are no longer clipped.  A PNG figure was printed with
    its font size doubled along with its canvas, but `-F` is relative to the
    canvas, so the text came out at twice its nominal size and a long title
    ran past both edges of the frame.  43 of the 83 titled figures in one
    package build were affected.  Figures are still printed at twice the
    nominal size, which was the point of the doubling.
