Sync

- Added task server details to the 'diagnostics' command output.
- Added new configuration variables to the 'show' command.
- rc.taskd.server specifies host:port of the task server.
- rc.taskd.credentials specifies user credentials for the task server.
- rc.taskd.certificate specifies the task server certificate.
- rc.debug.tls shows TLS log information, for debugging.
Documentation

- Added missing dateformat components 'j' and 'J' to the man page.
Sync

- Implemented sync over TLS.
- Obsoleted the Socket code, replacing it with TLSClient, TLSServer.
- Added task server details to the 'diagnostics' command output.
- 'rc.debug.tls' controls the GnuTLS log level.
- Removed redundant cmake diagnostics.
Documentation

- Documented the new configuration settings for task server communication.
Build Errors

- Added missing includes.
Build Error

- Missing include.