refs #3813 jquery, jqueryui & jqplot update + some fixes
refs #3813 jqueryui css update + dialog fixes
refs #3813 widget reload on changing column layout was broken
site selectors should not hide preselected value in that cases, as it isn't possible to reselect that value if it has been changed
fixed site selection issue: hidden input field wasn't updated
refs #3813 readding jQuery.browser plugin, as it has been removed in 1.9
refs #3813 css files in libs folder should always be included first, so they can be overwritten in piwik css as clean as possible
refs #3813 use piwik tooltip styling for map tooltips
refs #3813 use jqueryui tooltip plugin instead of piwiks selfmade one for datatables
refs #3813 use jqueryui tooltip plugin instead of piwiks selfmade one for transitions
refs #3813 use jqueryui tooltip plugin instead of piwiks selfmade one for overlay
refs #3813 use jqueryui tooltip plugin instead of piwiks selfmade one for jqplot graphs
refs #3813 removing now unused piwik tooltip.js
refs #3813 minified jqplot