NB groups variables according to inheritance.. e.g. inherited class variables
are shown under the Inerited node in the local variables window.

I propose to extend this to accessibility. Visual Studio, as an example, uses
different icons to show the accessibility. E.g. a lock for protected, nothing
for public and other symbols for private variables. It also separates static and
non static variables with different symbols.

And while we're at it, perhaps the symbols used could be replaced... it's all
rather greenish and that makes it hard to distinguish between the symbols used
in the tree. Other IDEs use a whole variety of colors and different shapes.