#9 memory leak like effect in DefaultMBModel.clear()

[Christoph Müller]

The clear() method DefaultMBModel does not clear the
HashMap 'relations' holding the ID-Relation associations.
This results in an effect like a memory leak since the
references to the Relations are kept in 'relations'.
Therefore, the garbage collector can never release the
memory of the Relations.

[Jan Roehrich]

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this bug has been fixed in actual CVS version