Add missing MARBLE_EXPORT to make it possible to derive from LayerInterface in applications using Marble, needed to make use of the new MarbleModel::addLayers function introduced in commit 1093625.
Add missing MARBLE_EXPORT to make it possible to derive from LayerInterface in applications using Marble, needed to make use of the new MarbleModel::addLayers function introduced in commit 1093625.


svn path=/trunk/KDE/kdeedu/marble/; revision=1103338

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