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.
missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/share/pyshared/cubicweb/skeleton/debian/rules.tmpl)