2010-02-05: tycho_1.3-rc1
 - Feature: Now using log4j for logging
 - Feature: VR message plugins allow extension of the VR without modifying core Tycho code
 - Feature: Clients table now has a (locally) unique local_client_id field
 - Feature: Generic SQL queries for the VR, implemented through VR message plugins. Can now add multiple tables and perform more complex queries in the VR.
 - Cleanup: Additional senders (shmem and router) which greatly simplify the internal logic for sending messages