Add a convenience func to retrieve the internal attr. hist.

A new function that can be imported to read the internal attribute history. The history is conveniently converted to a numpy.array.

What is missing: I could also extract the time stamps but did not know how to add that to the retrieved array. Could be done later.

lib/get_internal_attribute_history.py

@@ -12,6 +12,5 @@ def get_internal_attribute_history(device: DeviceProxy, attribute_name: str, dep
         raise ValueError("Cannot access the internal history of the attribute '{}/{}'.".format(device.name(), attribute_name)) from e
 
     history_values = array([entry.value for entry in history])
-    history_values_transposed = history_values.transpose()
-    values = array([vals for vals in history_values_transposed])
+    values = history_values.transpose()
     return values