Version 6.4.13

Main changes of this release are:

• full support for ietf-yang-semver, ietf-yang-revisions
• experimental schema-comparison support
  • reference implementation for a new RFC draft
• new yangupdate tool
• yanglint strict IETF module validation (similar to pyang --ietf)
• sized array public API
• SID generator for CBOR
• lots of other bugfixes and improvements