use a horizontal layout which uses the available space better
use a horizontal layout which uses the available space better

svn path=/trunk/KDE/kdeedu/marble/; revision=1183282

tzapzoor/marble,Earthwings/marble,tucnak/marble,probonopd/marble,rku/marble,rku/marble,utkuaydin/marble,David-Gil/marble-dev,adraghici/marble,quannt24/marble,adraghici/marble,probonopd/marble,quannt24/marble,Earthwings/marble,tucnak/marble,utkuaydin/marble,quannt24/marble,utkuaydin/marble,AndreiDuma/marble,tzapzoor/marble,tucnak/marble,probonopd/marble,quannt24/marble,AndreiDuma/marble,rku/marble,David-Gil/marble-dev,utkuaydin/marble,tzapzoor/marble,tzapzoor/marble,David-Gil/marble-dev,oberluz/marble,probonopd/marble,oberluz/marble,oberluz/marble,tucnak/marble,rku/marble,AndreiDuma/marble,adraghici/marble,David-Gil/marble-dev,quannt24/marble,adraghici/marble,tzapzoor/marble,AndreiDuma/marble,Earthwings/marble,Earthwings/marble,tzapzoor/marble,probonopd/marble,quannt24/marble,AndreiDuma/marble,David-Gil/marble-dev,utkuaydin/marble,oberluz/marble,AndreiDuma/marble,quannt24/marble,utkuaydin/marble,Earthwings/marble,David-Gil/marble-dev,Earthwings/marble,tucnak/marble,adraghici/marble,adraghici/marble,tzapzoor/marble,tzapzoor/marble,oberluz/marble,oberluz/marble,probonopd/marble,rku/marble,tucnak/marble,probonopd/marble,tucnak/marble,rku/marble