yams #232756 Implement CWEP002 [validation pending]

Add a new relation type : ComputedRelation for relation rewriting in RQL request. Add formula attribute for computed attribute

see: http://hg.logilab.org/review/cwep

prioritynormal
typeenhancement
done in0.40.0
load20.000
load left0.000
closed by#35952c146e39 [CWEP002] Handle permissions of computed relations
patch[CWEP002] reader: reorder schema finalization [applied][CWEP002] Add ComputedRelation to define the type of a relation with a rule [applied][CWEP002] Handle permissions of computed relations [applied][CWEP002] Handle permissions of computed attributes [applied][CWEP002] Add a schema.finalize() method [applied][CWEP002] Adding `formula` kwarg for the rule of a computed attribute. [applied][CWEP002] Add ComputedRelation to define the type of a relation with a rule [folded]