* Disallow alias creation if entity/accessor combination exists
* Add changelog
* Address review comments
* Add handling to aliasUpdate, some field renaming
* Update tests to work under new entity-alias constraint
* Add check to entity merge, other review fixes
* Log duplicated accessors only once
* Fix flaky test
* Add note about new constraint to docs
* Update entity merge warn log
Pratyoy Mukhopadhyay