GTK frontend, global progressbas support proposed

[Attilio Fiandrotti <fiandro@tiscalinet.it>]

Hi everyone

Some days ago colin watson suggested to introduce in the PROGRESS 
protocol the possibility to have more than one progressbar: "it would be 
interesting to have a global progress bar indicating the progress of the 
whole installation (roughly, your position in the main menu)."
I strongly support colin's idea: a global progressbar could be very 
useful and could improve used friendlyness of the installer very much.
For my thesis i've been asked to implement green/red checkmarks aside 
the main menu buttons to keep track of already configured steps : tought 
this can surely be done i think it would be better to introduce the 
global progress bar colin suggested.

what do you think about it?

ciao

attilio