#53 JD2: Node resizing

[Frank Bergmann]

- the resize feature of nodes in JD2 is different from
what one would expect ...

- it could also result in a selection bug. To reproduce:

- create node ...
- select node ...
- select the bottom left corner and drag ths corner
over the upper right corner ...

==> the node is inverted, it is no longer a rounded
rectangle & no longer selectable by clicking on the
nodename