- Add licence headers to new files

- Add patch from Zack Middleton which fixes a few issues still

code/renderer/tr_mesh.c

@@ -185,12 +185,10 @@ int R_ComputeLOD( trRefEntity_t *ent ) {
 		// and use that as a criteria for selecting LOD
 
 #ifdef RAVENMD4
-		// This is an MDR model.
-		
-		if(tr.currentModel->md4)
+		if(tr.currentModel->type == MOD_MDR)
 		{
 			int frameSize;
-			mdr = (mdrHeader_t *) tr.currentModel->md4;
+			mdr = (mdrHeader_t *) tr.currentModel->modelData;
 			frameSize = (size_t) (&((mdrFrame_t *)0)->bones[mdr->numBones]);
 			
 			mdrframe = (mdrFrame_t *) ((byte *) mdr + mdr->ofsFrames + frameSize * ent->e.frame);