writing the resume of the recent development of the HeatMapViewer in the CHANGES file
updating TODOs
Adding warning when the view saves it's configurations

When the node view of the HeatMapViewer closes, it saves the configurations. Since this might take a moment, the user could think that the program hangs. For information there is a warning plotted now. I also added a TODO, to implement a dialog in the serialization routine of the node model so it can't be overseen. The dialog should also give the option to cancel the routine.
adding focus enabling of the HeatMapViewerNodeView

... so the keyboard shortcuts are effective without clicking in the view menu first.
Changing waring in HeatMapViewerNodeView

instead of a node warning (setPlotWarning) that also shows a exclamation icon under the node (in the workbench), now just a warning is plotted.
removing redundant toolbar configuration statements.
PlateViewer is resizable now (issue #10)

Using the BoxLayout so the heatmap fills out the parent panel of the PlateViewer.
Instead of painting the JPanel of the heatmap in the "empty value" color (artifacts on the bottom and the right border during resizing), now the well not holding a HeatWell object, are painted separately.

I also removed a unused field (a list containing the HeatWells)
ScreenViewer does not not cut plates off during resizing anymore (issue #6)

The way the number of rows and columns was changed. In particular the scrollbar width is now also taken into account.
During the changing, the HeaTrellis class was somewhat simplified (some code became obsolete)