[GRASS5] New gui.tcl generic user interface

[Hamish]

> It is now possible to determine when a command has finished executing.
> Output text has an added graphic along with the command text when the
> command is run. When the command finishes another graphic is
> displayed along with the text "Done."

Does the "Run" button get greyed out during run-time?

Can the "Done." graphic check exit status and either be a green
check-mark or red "X" depending on $?.

a lot of long standing wishes here, thanks..

Hamish