* Work on upgrading core
* Work on R5 updates
* Work on core updates
* Test fix
* Update model version properties file for R5
* Bump core version
* Test fixes
* Add 4.2.0-SNAPSHOT version to versions page in docs
* Don't succeed validation on unknown codesystem
* Test fixes
* Work on error messages
* Work on code validation API
* work on tests
* Work on validation
* Test fix
* Update DSTU3 validation reources
* Upgrade structures
* Test fixes
* Start refactoring terminology delta operations
* Work on delta operations
* Work on concept saving
* Split term services into smaller services
* Work on term delta operations
* Work on term svcs
* Work on term operations
* More work on delta uploader
* Add a test
* Wrk on term service
* Fix compile error
* Some refactoring
* Test fix
* Test fix
* Test fixes
* Test fix
* Test fixes
* Test fixes
* Work on delta
* Work on tests#
* Test fixes
* Improve resequencing logic
* Build test
* More testing
* More build testing
* More work on tests
* CHange test logging
* Fix term service PID issue
* Update src/changes/changes.xml
Co-Authored-By: Diederik Muylwyk <diederik.muylwyk@gmail.com>
* Address review comment
* Some cleanup
* Test fix
* Fix some tests
* Work on upload command
* Test fixes
* Work on validation fixes
* Work on validation against pre-expansion
* Work on direct validation
* A bit of cleanup
* Add some javadoc
* Force another build
* Test fixes
* Fix tests
* Fix tests