- Added server credential handling.
- Added server error handling.
- Added task download handling.
- Added backlog truncation and synch_key handling.
- Added display of server-side messages.
- Cleaned up NEWS file for 2.3.0.
- Removed duplicate info in diagnostics command output.
- Implemented the high-level communications, still without TLS.
- Includes temporary diagnostics, and unlocalized error messages. These will
converge upon proper and useful error messages as the command matures.