Renamed "encrypted IVs" as "tags" (actual crypto changes to follow).

api/net/sf/briar/api/crypto/CryptoComponent.java

api/net/sf/briar/api/transport/BatchConnectionFactory.java

api/net/sf/briar/api/transport/ConnectionReaderFactory.java

api/net/sf/briar/api/transport/ConnectionRecogniser.java

api/net/sf/briar/api/transport/ConnectionWriterFactory.java

api/net/sf/briar/api/transport/StreamConnectionFactory.java

api/net/sf/briar/api/transport/TransportConstants.java

components/net/sf/briar/crypto/CryptoComponentImpl.java

...nents/net/sf/briar/transport/ConnectionDecrypterImpl.java

...ents/net/sf/briar/transport/ConnectionDispatcherImpl.java

...nents/net/sf/briar/transport/ConnectionEncrypterImpl.java

...s/net/sf/briar/transport/ConnectionReaderFactoryImpl.java

...ents/net/sf/briar/transport/ConnectionRecogniserImpl.java

...s/net/sf/briar/transport/ConnectionWriterFactoryImpl.java

components/net/sf/briar/transport/IvEncoder.java

.../sf/briar/transport/batch/BatchConnectionFactoryImpl.java

...net/sf/briar/transport/batch/IncomingBatchConnection.java

...t/sf/briar/transport/stream/IncomingStreamConnection.java

...f/briar/transport/stream/StreamConnectionFactoryImpl.java

test/net/sf/briar/ProtocolIntegrationTest.java