prettied up histogram hover, added line width options, fixed excessive refresh on string query

panels/stringquery/module.html

@@ -31,7 +31,7 @@
         </span>
       </form>
       <button type="submit" class="btn btn-info" ng-click="send_query(panel.query)"><i class="icon-search"></i> Search</button>
-      <button type="submit" class="btn" ng-click="send_query(panel.query);add_query();"><i class="icon-plus"></i> Add Query</button>
+      <button type="submit" class="btn" ng-click="add_query();"><i class="icon-plus"></i> Add Query</button>
   </div>
   <div ng-show="panel.multi && panel.multi_arrange == 'vertical'">
     <form>