code improvements for the viewer

[Roland Illig]

Pavel Tsekov wrote:
> Another problem that I see here (though this might be related to some
> local changes). If growing view is used i.e. viewing .bz2, .gz2, .rpm,
> etc, the cursor is displayed at the end of the status line until the last
> page of text is reached.

I can reproduce it here.

Where would you like to have the cursor? In the lower right corner? 
(This would only affect the text mode, as in hex mode, the cursor is 
already placed at the current offset.)

Roland