* Move almost all uses of StringBuffer to StringBuilder,

for efficiency (thanks Arsene for the suggestion)

router/java/src/net/i2p/data/i2np/DateMessage.java

@@ -70,7 +70,7 @@ public class DateMessage extends I2NPMessageImpl {
     
     @Override
     public String toString() {
-        StringBuffer buf = new StringBuffer();
+        StringBuilder buf = new StringBuilder();
         buf.append("[DateMessage: ");
         buf.append("Now: ").append(_now);
         buf.append("]");