[CWEP002] Add support for computed attribute synchronization
Related to #3546717.
Test and handle the behaviour with several formulas and identified use cases. To
do so add a birth year and a computed attribute age to Person in the test
schema.
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html