Updated daqpower package

- Now works with earlier versions of the DAQmx driver. This is needed to
  be able to run the server on Linux systems, which support older
  verisions of the driver only.
- DAQ error messages are now properly propaged to the client (PyDAQmx
  uses "mess" rather than "message" attribute to store the message in
  the Exception obejects).
- pylint and pep8 fixes

wlauto/instrumentation/daq/__init__.py

@@ -134,8 +134,8 @@ class Daq(Instrument):
     ]
 
     def initialize(self, context):
-        devices = self._execute_command('list_devices')
-        if not devices:
+        status, devices = self._execute_command('list_devices')
+        if status == daq.Status.OK and not devices:
             raise InstrumentError('DAQ: server did not report any devices registered with the driver.')
         self._results = OrderedDict()
 
@@ -235,7 +235,7 @@ class Daq(Instrument):
             raise InstrumentError('DAQ: {}'.format(result.message))
         else:
             raise InstrumentError('DAQ: Unexpected result: {} - {}'.format(result.status, result.message))
-        return result.data
+        return (result.status, result.data)
 
 
 def _send_daq_command(q, *args, **kwargs):