Removed unnecessary calls to default super constructors.

briar-api/src/net/sf/briar/api/TransportConfig.java

briar-api/src/net/sf/briar/api/TransportProperties.java

briar-api/src/net/sf/briar/api/db/DbException.java

briar-tests/src/net/sf/briar/BriarTestCase.java

briar-tests/src/net/sf/briar/ProtocolIntegrationTest.java

briar-tests/src/net/sf/briar/crypto/CounterModeTest.java

briar-tests/src/net/sf/briar/crypto/KeyDerivationTest.java

briar-tests/src/net/sf/briar/db/DatabaseComponentTest.java

briar-tests/src/net/sf/briar/db/H2DatabaseTest.java

...ests/src/net/sf/briar/messaging/PacketReaderImplTest.java

...ests/src/net/sf/briar/messaging/PacketWriterImplTest.java

...riar/messaging/simplex/OutgoingSimplexConnectionTest.java

...ar/messaging/simplex/SimplexMessagingIntegrationTest.java

...rc/net/sf/briar/transport/ConnectionRegistryImplTest.java

...c/net/sf/briar/transport/IncomingEncryptionLayerTest.java

...c/net/sf/briar/transport/OutgoingEncryptionLayerTest.java

.../src/net/sf/briar/transport/TransportIntegrationTest.java