Item12518: add support for jquery-2.x without disturbing oldIEs

This is done via conditional comments interpreted by IE:

<!--[if lt IE 9]>
<script type='text/javascript' src='%PUBURLPATH%/%SYSTEMWEB%/JQueryPlugin/$jQueryIE.js'></script>
<![endif]-->
<!--[if gte IE 9]><!-->
<script type='text/javascript' src='%PUBURLPATH%/%SYSTEMWEB%/JQueryPlugin/$jQuery.js'></script>
<!--<![endif]-->

This adds YACS (yet another configuration setting) ... {JQueryVersionForOldIEs} (default empty):

• if set to empty, all browsers get the same library version
• if set to some jquery-1.x setting, oldIEs will be served this one while modern browser benefit from more speed in newer versions of jquery

A standard setting would be:

• {JQueryVersion} = jquery-2.0.1
• {JQueryVersionForOldIEs} = jquery-1.10.0

The jquery-2.x and jquery-1.x branches are kept api compatible for the next foreseeable future. Thus keeping backwards compatibility while leaving room for further improvements in newer browsers.

-- MichaelDaum - 30 May 2013

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