BF: ensure that voxel indices have the correct shape

Some CIFTI files write all voxel indices on the same line, leading to a 1D array. This bug fix ensures that nibabel will not crash when reading those files.

Author: MichielCottaar

nibabel/cifti2/parse_cifti2.py

@@ -547,7 +547,7 @@ def flush_chardata(self):
             # conversion to numpy array
             c = BytesIO(data.strip().encode('utf-8'))
             parent = self.struct_state[-1]
-            parent.voxel_indices_ijk.extend(np.genfromtxt(c, dtype=np.int))
+            parent.voxel_indices_ijk.extend(np.genfromtxt(c, dtype=np.int).reshape(-1, 3))
             c.close()
 
         elif self.write_to == 'VertexIndices':