Declare constructor explicit.
Declare constructor explicit.

svn path=/trunk/KDE/kdeedu/marble/; revision=942017

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