* Move almost all uses of StringBuffer to StringBuilder,

for efficiency (thanks Arsene for the suggestion)

core/java/test/net/i2p/crypto/HMACSHA256Bench.java

@@ -70,12 +70,12 @@ public class HMACSHA256Bench {
 		long maxLong1 = 0;
         
 		byte[] smess = new String("abc").getBytes();
-		StringBuffer buf = new StringBuffer();
+		StringBuilder buf = new StringBuilder();
 		for (int x = 0; x < 2*1024; x++) {
 			buf.append("a");
 		}
 		byte[] mmess = buf.toString().getBytes(); // new String("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq").getBytes();
-		buf = new StringBuffer();
+		buf = new StringBuilder();
 		for (int x = 0; x < 10000; x++) {
 			buf.append("a");
 		}

core/java/test/net/i2p/crypto/SHA1HashTest.java

@@ -133,7 +133,7 @@ public class SHA1HashTest extends TestCase{
     }
  
     private final String toHex(final byte[] bytes) {
-        StringBuffer buf = new StringBuffer(bytes.length * 2);
+        StringBuilder buf = new StringBuilder(bytes.length * 2);
         for (int i = 0; i < bytes.length; i++) {
             if ((i & 3) == 0 && i != 0)
                buf.append(' ');

core/java/test/net/i2p/crypto/SHA256Bench.java

@@ -57,12 +57,12 @@ public class SHA256Bench {
 		long maxLong1 = 0;
         
 		byte[] smess = new String("abc").getBytes();
-		StringBuffer buf = new StringBuffer();
+		StringBuilder buf = new StringBuilder();
 		for (int x = 0; x < 10*1024; x++) {
 			buf.append("a");
 		}
 		byte[] mmess = buf.toString().getBytes(); // new String("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq").getBytes();
-		buf = new StringBuffer();
+		buf = new StringBuilder();
 		for (int x = 0; x < 1000000; x++) {
 			buf.append("a");
 		}

core/java/test/net/i2p/stat/RateTest.java

@@ -13,7 +13,7 @@ public class RateTest extends TestCase {
             rate.addData(i * 100, 20);
         }
         rate.coalesce();
-        StringBuffer buf = new StringBuffer(1024);
+        StringBuilder buf = new StringBuilder(1024);
         
         rate.store("rate.test", buf);
         byte data[] = buf.toString().getBytes();