cubicweb #2303291 add_js jquery.jqplot.js leads to ridiculously big auto-added javascript content [waiting feedback]

When used directly from source, jqplot auto adds a bunch of dependency scripts (jqplot.core.js, jqplot.linearTickGenerator.js, ...) by inserting <script> tags which src attribute is built from the jquery.jqplot.js URL itself. If this one was itself concatenated, the dependency script URLs are also : this leads to potentially huge ducplicate javascript code reloading.

It would be nice to provide a simple mecanism to avoid concatenating the URL of such javascript libraries.

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