[views] implement json / jsonp export views (closes #1942658) Json export views are based on the same model as CSV export views. There are two distinct views : - *jsonexport* : direct conversion of the result set into json - *ejsonexport* : convert entities into json The JSONP parameter is named ``callback`` (same as on geonames, dbepdia and a lot of sites) An optional `_indent` request parameter can be passed to pretty print the results.

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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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