#3813 jQuery / jQueryUI / jqPlot upgrades to latest versions

* upgraded jQuery / jQueryUI / jqPlot to current version
* fixed some errors caused by the upgrade
* readded jquery.browser plugin, which was removed in jQuery 1.9, but is still required by some parts of our code
* refactored piwik tooltips - now only jquery ui tooltip is used (except of those used in new map widgets)

we still should do intensive testing in several browsers