Core: Fixed constness in DataMapper and added some comments
Core: Fixed constness in DataMapper and added some comments


inviwo/inviwo,inviwo/inviwo,Sparkier/inviwo,Sparkier/inviwo,Sparkier/inviwo,inviwo/inviwo,inviwo/inviwo,Sparkier/inviwo,Sparkier/inviwo,inviwo/inviwo,inviwo/inviwo