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/refreshGraph.js

@@ -0,0 +1,8 @@
+// refresh the sidebar mini graph every 15 seconds
+
+function refreshGraph() {
+    document.getElementById('sb_graphcontainer').style.backgroundImage = 'url(/viewstat.jsp?stat=bw.combined&periodCount=20&width=220&height=50&hideLegend=true&hideGrid=true&time=' + new Date().getTime();
+    setTimeout(refreshGraph, 15000);
+}
+
+refreshGraph();