Make it simpler to call NEOCluster.__newProcess.
Categorise process by node type, and add accessors to retrieve all nodes of a given type.
Generate node uuids in the test and implement accessors for this.


git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@1146 71dcc9de-d417-0410-9af5-da40c76e7ee4