#10 NKFPanel is now a Singleton
#10 added getter for tNutzung
#10 in NKFTableModel: save selection of NKFPanel.tNutzung before fireTableDataChanged() and set the selection again afterwards
#10 when a new Nutzung is added the selection of the table is set to the last row, thus the new Nutzung
#10 removed useless comments
#10 jalopy
#10 removed wrong comment
#10 NKFOverviewPanel is a singleton now
#10 changed getter name of tNutzung
#10 added getter for tSummeNutzungen
#10 in NKFOverviewTableModel: save selection of NKFOverviewPanel.tSummeNutzungen before fireTableDataChanged() and set the selection again afterwards
#10 when Nutzung is removed from Table clear selection
#10 NKFPanel was added twice to its TableModelListener, it is now added only once
#10 created Utils class. Added function to fire TableDataChanged event and keep the selection of a table
#10 use of function TableSelectionUtils.fireTableDataChanged_keepSelection() in NKFTableModel and NKFOverviewTableModel
#10 refactored fireTableDataChangedAndKeepSelection()
#10 jalopy
#10 VerwaltungsPanel is a singleton now and has a getter for tNutzung
#10 created refreshTableModel() in VerwaltungsTableModel and use it there and in VerwaltungsPanel
in NKFPanel, scroll to selected row, when new Nutzung is added and after sort or unsort