cubicweb #2131463 RQL: change update_cb_stack signature [open]

Having update_cb_stack called with node and statement would enable us to do some more intelligent things in RQL functions, such as http://www.cubicweb.org/ticket/1903304 (see comment about the FSPATH function)

priorityimportant
typeenhancement
done in<not specified>
load0.300
load left0.300
closed by<not specified>