Bug 13218: (RM followup) only scroll on actually variable stuff

Bug 13218: (RM followup) only scroll on actually variable stuff

Most of the page contents have fixed size. The only exception is the
targets list. If the target list grows, then the whole page needs to be scrolled
in order to reach the buttons.

We should make the z3950 targets area scrollable, and remove scrolbars from all
over the place.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit c63003dd5a73f1276d7e1191bef30822326f2994)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>