Fix to label atlas lookup - voxel coords not being cast to ints.

fsl/data/atlases.py

@@ -415,7 +415,7 @@ class LabelAtlas(Atlas):
         """
 
         voxelLoc = transform.transform([worldLoc], self.worldToVoxMat.T)[0]
-        voxelLoc = voxelLoc.round()
+        voxelLoc = [int(v) for v in voxelLoc.round()]
 
         if voxelLoc[0] <  0             or \
            voxelLoc[1] <  0             or \