magic mushroom

• Relations between Node traits
• fix Relation.local parameter order
• tighter type bounds for NODE in nodeTraitFactories
• fix Relation sets in group
• fix HyperRelation sets in group
• fix: consider child node traits when generating type bounds for group accessors
• fix wrapping HyperRelations in NodeTraitFactories
• fix listing of hypernodes in relations and nodes
• fix: group trait accessors: list relations/hyperRelations between trait itself
• regard node traits when collecting all in- and outrelations of a node
• include hyperrelations in relation accessors for nodes
• own local methods for node and relation traits