resolved dependency issue

nifty/__init__.py

@@ -54,6 +54,8 @@ from operators import *
 
 from probing import *
 
+from library import *
+
 from sugar import *
 
 import plotting

nifty/energies/__init__.py

@@ -19,4 +19,3 @@
 from energy import Energy
 from line_energy import LineEnergy
 from memoization import memo
-from wiener_filter_energy import WienerFilterEnergy

nifty/library/__init__.py

+from operator_library import *
+from energy_library import *

nifty/library/energy_library/__init__.py

+from wiener_filter_energy import WienerFilterEnergy
\ No newline at end of file

nifty/energies/wiener_filter_energy.py → nifty/library/energy_library/wiener_filter_energy.py

-from .energy import Energy
-from nifty.operators import WienerFilterCurvature
+from nifty.energies.energy import Energy
+from nifty.library.operator_library import WienerFilterCurvature
 
 class WienerFilterEnergy(Energy):
     """The Energy for the Wiener filter.

nifty/library/operator_library/__init__.py

+from wiener_filter_curvature import WienerFilterCurvature
\ No newline at end of file

nifty/operators/__init__.py

@@ -39,5 +39,3 @@ from propagator_operator import HarmonicPropagatorOperator
 from composed_operator import ComposedOperator
 
 from response_operator import ResponseOperator
-
-from curvature_operators import WienerFilterCurvature

nifty/operators/curvature_operators/__init__.py

-from wiener_filter_curvature import WienerFilterCurvature