Console sidebar improvements

Sidebar:
- Adjust vertical spacing of general section
- Rename 'General' section to 'Router Info' and move ident info to h3 tooltip
  (ticket #1996)
- Replace 'Short Router Info' with a new 'Advanced Router Info' section in
  default advanced sidebar (adds memory usage and clock skew)
- Add optional embedded bandwidth graph (experimental)
- Add optional memory usage bar
- Add optional Advanced Peers section (adds failing and banned peers)
- Add Help link to 'I2P Internals' section
- Add help page anchored links and troubleshooting to 'Help & FAQ' section
- Add download progress bar for router and plugin updates
- Add 'Advanced Minimal' sidebar configuration
- Add Jobs and Events links to Advanced section
- Add additional reachability states for clockskew and vmcomm (with icons)

Homepage: Add 'Customize Sidebar' link to signpost the feature now that there
  are more optional sections available (ticket #1996)

apps/routerconsole/jsp/js/ajax.js

@@ -34,6 +34,17 @@ function ajaxDone(url, target, refresh) {
       document.getElementById(target).innerHTML = failMessage;
       //document.getElementByClassName("hideifdown").style.display="none";
     }
+
+    // conditionally load sidebar refreshGraph script
+    var graph = document.getElementById('sb_graphcontainer');
+    if (graph) {
+      var js_refreshGraph = document.createElement('script');
+      js_refreshGraph.type = "text/javascript";
+      js_refreshGraph.src = "/js/refreshGraph.js";
+      js_refreshGraph.async = true;
+      document.getElementsByTagName('head')[0].appendChild(js_refreshGraph);
+    }
+
     setTimeout(function() {ajax(url, target, refresh);}, refresh);
   }
 }