Summary of important user-visible changes for pkg-octave-doc 0.7.4:
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 ** Demo figures are saved as PNG again, printed at twice the nominal size so
    they stay sharp on a high-density display.  SVG, the default since 0.7.3,
    routes through gl2ps, whose feedback buffer overflows on figures rich in
    filled areas: building the statistics package produced 60 SVG files above
    150 KB, the largest 25.3 MB, and one figure consumed 15.5 GB of temporary
    space before the build wedged.  The same figure is 64 KB as a PNG, and no
    asset in a 538-page build exceeds 138 KB.

 ** SVG remains available, in full, through the new `figformat` Name/Value
    pair, accepted by `package_texi2html`, `function_texi2html`,
    `classdef_texi2html` and `build_DEMOS`:

        package_texi2html ("mypackage", "figformat", "svg");

    Note that for a figure of ordinary complexity SVG is the smaller of the
    two; PNG is the default because its worst case is bounded.

 ** Demo figure files separate their number with a "-", as in
    `mean-101.png`, since "_" already stands for the file separator of an
    old-style "@class/method" name and a function name may contain one.

 ** Demo figures are named after their owner exactly as its HTML page is, so
    the figures of `prob.NormalDistribution.pdf` now sit beside
    `prob.NormalDistribution.pdf.html` instead of under a flattened name.

 ** Pre-existing HTML files are purged from the documentation's root directory
    at the start of a package build, so pages of functions that were removed
    or renamed no longer linger.  Only `.html` files are affected, leaving
    `.nojekyll` and anything else in place.

 ** Source-code links are resolved for package-qualified names such as
    `prob.NormalDistribution`.  `exist` reports 0 for those, so every class
    inside a package directory previously shipped without a source link.

 ** A classdef page no longer emits an empty source-code link when the URL
    cannot be resolved.
