- Job Queue/stats: add stat/graph for amount of scheduled jobs (router.tunnelBacklog)

- FloodfillMonitorJob:
  - Use avg of router.tunnelBacklog instead of current backlog
- Some language/spelling fixes

core/java/src/net/i2p/client/I2PSessionImpl.java

@@ -60,7 +60,7 @@ import net.i2p.util.VersionComparator;
  * only one thread should send messages at any given time
  *
  * Public only for clearCache().
- * Except for methods definied in I2PSession and I2CPMessageEventListener,
+ * Except for methods defined in I2PSession and I2CPMessageEventListener,
  * not maintained as a public API, not for external use.
  * Use I2PClientFactory to get an I2PClient and then createSession().
  *