[rtags] Allow to 'derive' rtags Since some releases, rtags (structure underlying uicfg) have selector and may be copied using something like: new_rtags = deepcopy(original_rtags) new_rtags.__module__ = __name__ new_rtags.__select__ = custom_selector The problem is that starting from that, both rtags wil diverge and changes in original_rtags won't be considered, while we usually want to set a few specific rules only in new_rtags. To fix this problem, this cset introduces the notion of "derivated/parent" rtag, eg: new_rtags = original_rtags.derive(__name__, custom_selector) Beside easier copying, when using the above method changes in original_rtags which are not overriden by new_rtags will be considered since it only hold its specific rules but look among its parent chain for non-found keys. Along the way, flake8 unittest_rtags. Closes #16164880

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/* sortable tables */

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table.listing tr .headerSortUp {

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  background-image: url(asc.gif);

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}

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table.listing tr .headerSortDown {

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  background-image: url(desc.gif);

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}

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table.listing tr .headerSortDown, table.listing tr .headerSortUp {

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   background-color: %(listingBorderColor)s;

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   background-repeat: no-repeat;

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   background-position: center right;

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}

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