Changed some method signatures in NodeUpdateData.

An instance has to store QueryResult objects rather than plain nodes.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/branches/immutableNodes@1571051 13f79535-47bb-0310-9956-ffa450edef68
InMemoryModel.setProperty() now handles nodes to be removed.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/branches/immutableNodes@1571053 13f79535-47bb-0310-9956-ffa450edef68