* Improved unknown handling
* Configure option `CLICON_YANG_DIR` is changed from a single directory to a path of directories
* Note CLIXON_DATADIR (=/usr/local/share/clixon) need to be in the list
* RFC8040 Restconf replay support: start-time and stop-time query parameter support
* This only applies to "native" restconf stream support, Nchan mode has different replay functionality
* RFC5277 Netconf replay support using <startTime> and
* Replay support is only in-memory and not persistent. External time-series DB could be added.
* Both a "native" stream support and one using nginx/nchan pub/sub.
* See (apps/restconf/README.md) for details.
* clixon-config YAML file has new revision: 2018-10-21.