Import fixes in test_fmm.py

test/test_fmm.py

-from __future__ import division
-from __future__ import absolute_import
-from __future__ import print_function
-from six.moves import range
+from __future__ import division, absolute_import, print_function
 
 __copyright__ = "Copyright (C) 2013 Andreas Kloeckner"
 
@@ -25,6 +22,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 """
 
+from six.moves import range
 
 import numpy as np
 import numpy.linalg as la