javadoc cleanup to remove those damn warnings

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnel.java

...i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelRunner.java

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

core/java/src/net/i2p/client/I2PSession.java

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

core/java/src/net/i2p/crypto/AESEngine.java

core/java/src/net/i2p/crypto/CryptixAESEngine.java

core/java/src/net/i2p/crypto/DummyElGamalEngine.java

core/java/src/net/i2p/data/DataHelper.java

core/java/src/net/i2p/data/Payload.java

core/java/src/net/i2p/data/RouterAddress.java

core/java/src/net/i2p/data/TunnelId.java

core/java/src/net/i2p/data/i2cp/I2CPMessageImpl.java

core/java/src/net/i2p/stat/Rate.java

.../java/src/net/i2p/router/message/SendReplyMessageJob.java

router/java/src/net/i2p/router/peermanager/DBHistory.java