[R-gui] Another R-GUI

[Thomas Friedrichsmeier]

> The level isn't terribly critical -- we will need both, to describe
> both fine grained as well as higher level control of widgets,
> especially if there is to be any hope for crafting similar UIs.

> While they can initially be hardcoded,  flex-coding the underlying
> components will be preferred in the long run.

Ok, how about this for a compromise: Let's try to start out with as few and as complex/high level widgets as possible, and then slowly add more flexibility as the limitations become visible?