Bug fix: in case of local interaction between the proxy and the destination the ClientMessage is sent in non persistent mode and the client should be notify after the destination reaction. Before this patch if TTL are set the CM could be deleted and the client is blocked, so we remove the expiration date on the CM in case of local sending.

- Fix bug: setting cleaning task period didn't work.
- Use collection framework.
- Fix code formatting

Fix bug: setting cleaning task period didn't work.

A bad clock synchronization can cause issues when using messages TTL or receive with timeout.

Javadoc enhancements.

Evolution of the Joram administration functioning: reduces the number of messages types, avoids indirection in administration request and reply path.