[repository] refactor and optimize '?1' relation handling
* only skip auto remove if activeintegrity is explicitly disabled
* do it even for inlined relation, so hooks are properly called
* on entity creation, only cleanup what's needed
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