MarbleControlBox: Block zoomSlider signals instead of disconnect and reconnect.
MarbleControlBox: Block zoomSlider signals instead of disconnect and reconnect.

svn path=/trunk/KDE/kdeedu/marble/; revision=1126213

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