#8 Update input line before parsing

[Kurt Hutchinson]

It would be a good idea to update the view of the input line after the
user hits enter but before the line is actually parsed and executed.
This way if they call out to a long running script that keeps the event
loop going, the input line is automatically updated for them to type
in their next command. It's not a big deal as they can just delete the
line themselves, but the change is small so why not. Attached is a
diff for making this change in both the Tk and Gnome interfaces.

[Kurt Hutchinson]

Tk and Gnome interface diff