* Removed obsolete option: `CLICON_MODULE_LIBRARY_RFC7895'
* Obsolete config options given in the confi file are considered an error
* Added section in CONTRIBUTING relating to optimzation
* Changed reset merge to implicit default values.
* This avoids a potential overwriting of explicitly set default values in the existing config
* Adapted some code to [Make cligen_* functions const ](https://github.com/clicon/cligen/pull/83)
* Test: fixed test for * Fixed: [datamodel tree generated from basemodel tree is not proper when a list has more than one key and key is of enum type](https://github.com/clicon/clixon/issues/417)
- Change from RFC 7805: Remove revision if empty instead of sending empty revision
RFC 6022
- Added cli identity to RFC6022 transport
- Added source-host for natove restconf, bit no other sessions
- statistics and transport/source-host parameters
- extended internal NETCONF hello with transport and source-host attributes
clixon-lib,yang
- Moved all extended internal NETCONF attributes to the clicon-lib namespace
C-API:
- wrapped most attribute creation into new fn xml_add_attr()
* First version of clixon-autocli.yang semantics
* Default rules for module exclusion, list-keywords, completion, treeref-state
* Specialized rules for compress and exclusion of modules
* See [autocli documentation](https://clixon-docs.readthedocs.io/en/latest/cli.html#autocli)
* Obsoleted and moved autocli config options from clixon-config.yang to clixon-autocli.yang as follows:
* `CLICON_CLI_GENMODEL`, use: `autocli/module-default=false` instead
* Removed `clicon_cli_genmodel()`
* `CLICON_CLI_GENMODEL_TYPE`, use `autocli/list-keyword-default` and compress rules instead)
* Removed `clicon_cli_genmodel_type()`
* `CLICON_CLI_GENMODEL_COMPLETION`, use `autocli/completion-default` instead
* Removed `clicon_cli_genmodel_completion()`
* `CLICON_CLI_AUTOCLI_EXCLUDE`, use `autocli/rule/operation=exclude` instead
* `CLICON_CLI_MODEL_TREENAME`, use constant `AUTOCLI_TREENAME` instead
* Removed `clicon_cli_model_treename()`
* New YANG functions: yang_single_child_type, yang_find_namespace_by_prefix, yang_str2key
* Changed return values of yang_find_prefix_by_namespace
* Merged `cli_cli2xml()` into `cli2xml()`
* This means that files and datastores supporting modstate also looks for deleted or updated yang modules.
* A stricter binding which gives error if loading outdated YANG file does not exist.
* Stricter yang checks: you cannot do get-config on datastores that have obsolete YANG
* Added xerr output parameter to `xmldb_get0()`
