version 2.4.0 use xdg-open instead of htmlview on Fedora 7 and later change
        hicolor-icon-theme requirement to be "uncolored" (without
        "(post)"/"(postun)") don't let gtk-update-icon-cache fail scriptlets
        build internal print plugin, don't require external print plugins on
        Fedora 8 and later change license tags to GPLv2+ (main app), LGPLv2+
        (libs and devel) drop libXt-devel build requirement build-require
        pygobject2-devel directly don't let %postun fail remove obsolete
        buildroot, gimphelpmissing, icontheme, gifload, gimptool patches use
        more distinct build root use %buildroot consistently explicitely enable
        configure options more versionized build requirements don't rebuild
        autofoo files reformat spec file a bit