Merge branch 'unshared-messages' into 'master'

briar-api/src/org/briarproject/api/db/DatabaseComponent.java

...pi/src/org/briarproject/api/event/MessageSharedEvent.java

...-api/src/org/briarproject/api/sync/ValidationManager.java

briar-core/src/org/briarproject/db/Database.java

...r-core/src/org/briarproject/db/DatabaseComponentImpl.java

briar-core/src/org/briarproject/db/JdbcDatabase.java

briar-core/src/org/briarproject/forum/ForumManagerImpl.java

.../src/org/briarproject/messaging/MessagingManagerImpl.java

...briarproject/properties/TransportPropertyManagerImpl.java

...core/src/org/briarproject/sync/DuplexOutgoingSession.java

...core/src/org/briarproject/sync/ValidationManagerImpl.java

...ts/src/org/briarproject/db/DatabaseComponentImplTest.java

briar-tests/src/org/briarproject/db/H2DatabaseTest.java