#15 Visualisation does not reflect editing operations any more

[Christoph Müller]

The current CVS version of the MatrixBrowser does not
update the visual representation of the trees and the
relation pane when the model is updated, even if
appropriate ModelChangeEvents are fired. V2-0pre2 did
work.

The problem presumably is originated in the
TreeManager which had several TreeSynthesizers
registered as listeners and propagated
ModelChangeEvents it received from the MBModel to
these TreeSynthesizers. The current version of the
TreeManager does not have any listener registered. I
assume, that the TreeSynthesizers and the RelationPane
are not informed about the change in the data model.