Enables comparisons for timelines.

app/views/timelines/_form.html.erb

@@ -41,13 +41,7 @@ See doc/COPYRIGHT.rdoc for more details.
 
   <%= render :partial => "timelines/general", :locals => {:timeline => @timeline, :f => f}%>
 
-  <%# comparisons were removed so that they don't break for everyone once the
-      journalization changes start.
-
-        render :partial => "timelines/comparison", :locals => {:timeline => @timeline}
-
-      TODO enable comparisons once journalization is done.
-  %>
+  <%= render :partial => "timelines/comparison", :locals => {:timeline => @timeline} %>
 
   <%= render :partial => "timelines/vertical_planning_elements", :locals => {:timeline => @timeline}%>