Fix controls on experiment contents

Also fix bug with adjencent elements not updating controls.

Fixes SCI-35.

app/assets/javascripts/reports/new.js

@@ -979,6 +979,10 @@ function addElements(newElToBeReplaced, elements) {
   // Initialize everything on all elements
   _.each(newElements, function(element) {
     initializeReportElements($(element));
+
+    // Update previous and next element controls
+    updateElementControls(element.prev())
+    updateElementControls(element.next())
   });
 }
 

app/controllers/reports_controller.rb

@@ -482,6 +482,7 @@ class ReportsController < ApplicationController
         )
         el[:children] = generate_module_contents_json(my_module)
         res << el
+        res << generate_new_el(false)
       end
     end
     res