yams #142386 Clarify RelationType vs. RelationDefinition [open]

There are two options :

  • either use RType attributes that are meaningful for RDefs as a "default" value for new RDefs
  • or completely deny setting attributes that are meant to be set on RDefs (like __permissions__) on RTypes.

After some discussions at Logilab (syt, auc, fcayre, pyves), the second choice was preferred.

However, the present facility offered to generate RTypes implicitely from a RDef is to be kept.

done in1.0.0
load left2.000
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