remove
Description:
Removes a relation from the relation set.
This function unref's the Relation so it will be deleted unless there is another reference to it.
Parameters:
| this | an RelationSet | 
| relation | an Relation | 
Removes a relation from the relation set.
This function unref's the Relation so it will be deleted unless there is another reference to it.
| this | an RelationSet | 
| relation | an Relation |