deprecate get/set_shared_data API
Session or transaction data must be used instead.
We must forward .transaction_data to web/request from
which it was missing (this is indeed a _cw object API).
Closes #3799036.
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