Findbugs all over

- volatile -> atomic
 - unused code and fields
 - closing streams
 - hashCode / equals
 - known non-null
 - Number.valueOf
 - new String
 Still avoiding SAM, BOB, SusiMail

apps/routerconsole/java/src/net/i2p/router/web/PluginStarter.java

@@ -632,7 +632,7 @@ public class PluginStarter implements Runnable {
 
             ClassLoader cl = null;
             if (app.classpath != null) {
-                String cp = new String(app.classpath);
+                String cp = app.classpath;
                 if (cp.indexOf("$") >= 0) {
                     cp = cp.replace("$I2P", ctx.getBaseDir().getAbsolutePath());
                     cp = cp.replace("$CONFIG", ctx.getConfigDir().getAbsolutePath());