MT#4287 Remove datatables state on menu items

That is, when changing the main pages (controller more or
less) like from /reseller to /contact, remove previous
stored state.

share/templates/helpers/datatables.tt

@@ -25,6 +25,11 @@ $.extend( $.fn.dataTableExt.oStdClasses, {
             } );
 
 $(document).ready(function() {
+    var prev_controller = document.referrer.match(/:\/\/[^/]*\/([^/]+)/).pop();
+    var this_controller = window.location.pathname.match(/[^/]+/g)[0];
+    if (prev_controller != this_controller) {
+        localStorage.removeItem('ngcp_dt_[% helper.id_from_name %]_table');
+    }
 	var [% helper.id_from_name %]_table = $('#[% helper.id_from_name %]_table')
 	    .dataTable( {
         "sDom": "<'row-fluid ngcp_dt_top_elements'lf<r>>t<'row-fluid'<'pull-left'i><'pull-right'p>>",