#10 DefaultMBModel.getRelations() implementation

[Christoph Müller]

The implementation of the getRelations() method in
DefaultMBModel could be improved by iterating directly
the values() (LinkedLists of Relations) of 'relationTypes'
instead of iterating keySet() (RelationTypes) and
retrieving the LinkedList for each key using get(iter.next
()) from 'relationTypes'.

[Jan Roehrich]

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Yes, but DefaultMBModel is only a prototype. For better
performance choose RelationCachedModel.