Sysrepo

The release contains the following new features:
- `SR_SUBSCR_EV_ENABLED` notification event (subscriber can be notified about configuration that was copied from startup to running, allows reusing of the code for subscriber callbacks to read startup configuration),
- `sr_plugin_health_check_cb` plugins API for checking whether the plugin/managed application is healthy,
- helpers API: `sr_val_set_string` renamed to `sr_val_set_str_data` & modified, added `sr_val_build_str_data`, `sr_val_build_xpath` and some more helpers,
- added some examples & documentation,
- many bugfixes.

Release contains the following new features:
- Operational (state) data support
- Commit verifiers (change verification by subscribed applications)
- New, more efficient subtree-based data retrieval & RPC / Event notification API
- Application-local File Descriptor Watcher API (ability to use application-local event loop for notification delivery)
- Improved memory management & supporting utils
- Xpath Processing utils
- Python 2 & 3, Lua 5.1 & 5.2, Java bindigs

Release contains new subscription API & changeset retrieval functionality, sysrepo plugins infrastructure, sysrepocfg tool.

Release contains full edit-config functionality, full concurrency and locking support, sysrepo daemon, sysrepoctl tool, Python language bindings.

Release contains full get-config (data retrieval) functionality. Only library mode is currently supported.