* Accepted:
```
curl -X PUT http://localhost/restconf/data/mod:a -d {"mod:a":"x"}
```
* Not accepted (must prefix "a" with module):
```
curl -X PUT http://localhost/restconf/data/mod:a -d {"a":"x"}
```
* Undefine `RESTCONF_NS_DATA_CHECK` in include/clixon_custom.h to disable strict check.
* Start with `-- -r` to run the reset plugin
* Start with `-- -s` to run the state callback
* Rewrote yang dir load algorithm to follow the algorithm in [FAQ](FAQ(doc/FAQ.md#how-are-yang-files-found) with more precise timestamp checks, etc.
* clixon-config YAML file has new revision: 2019-03-05.
* New URN and changed top-level symbol to `clixon-config`
* Removed obsolete `_CLICON_XML_NS_STRICT` variable and `CLICON_XML_NS_STRICT` config option.
* Added clicon_socket_set() and clicon_socket_get() functions for cleaning up backend server and restconf FCGI socket on termination.
* Removed obsolete `-x` command-line option to clixon_cli.
* Moved datastore/text/ code to datastore/ since there is only one type of datastore.
* Added "magic script line" to test script for sourced and scriped exits
