Resolve "Implement basic structure for the hexagon experiment"

Closes #94 (closed)

• New Hexagon class for hexagon simulations
• A few associated unit tests

lisainstrument/hexagon.py

@@ -108,8 +108,7 @@ class Hexagon():
         # Three-signal combination
         self.three_signal_combination = self.carrier_beatnotes[:,0] \
             + self.carrier_beatnotes[:,1] + self.carrier_beatnotes[:,2]
-
-
+            
     def write(self, output='measurements.h5', mode='w'):
         """Write simulation results.
 
@@ -131,7 +130,6 @@ class Hexagon():
             self._write_attr(hdf5, 'carrier_beatnote_fluctuations', indices=self.BEATNOTES)
             self._write_attr(hdf5, 'three_signal_combination')
 
-            
     def _write_attr(self, hdf5, dataset, indices=None):
         """Write a single object attribute on ``hdf5``.