cubicweb #1161 make one big js bundle file for an installed instance [deprecated]

cubicweb-ctl create / upgrade commands could gather all js files from all the cubes used by the instance, concat them, and then run a packer (yui packer or whichever seems to be the best).

The result would be stored in a file named cubicweb-bundle.js and this file would be the only javascript file included in the html header.

Subsequent calls to req.add_js() would have no effect in "installed" mode.

The idea is also applyable to CSS files (except for the packer part).

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