[webrequest] introduce an alternative implementation using the repoapi DBAPI specific parts of ``CubicWebRequestBase`` are extracted in a ``DBAPICubicWebRequestBase`` decicated class and a new ``ConnectionCubicWebRequestBase`` is introduced that provide the same services but using a repoapi.ClientConnection as data source. For now the ``DBAPICubicWebRequestBase`` is still used by default.

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$(document).ready(function() {

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    $('a.rhythm').click(function (event){

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        $('div#pageContent').toggleClass('rhythm_bg');

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        $('div#page').toggleClass('rhythm_bg');

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        event.preventDefault();

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    });

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});