'NI_XZ' control mapping module

[rocco8773]

Adds ability to interface with the 'NI_XZ' control device. The 'NI_XZ' control device is used to moving a probe in the XZ-plane of the LaPD.

This merge includes:

1. Addition of the HDFMapControlNIXZ class for mapping the 'NI_XZ' control device
   • 100% coverage of tests
2. HDFReadControl needed to be updated such that the population of the'xyz' field does not fail, since the 'NI_XZ' dataset does not store y-coordinate values
   • Now, when defining the configs mapping dictionary, if the dataset field is defined as a null string '', then HDFReadControl assumes that the corresponding numpy field is supposed to be filled with zeros.
   • For example, if

     configs[cname]['state values']['xyz'] = {
         'dset paths': 'path/to/dataset',
         'dset field': ('x', '', 'z'),
         'shape': (3,),
         'dtype': np.float64,
      }
     

     then the y-coordinate, or data['xyz'][...,1], will be filled with zeros.
   • This will work for any numpy field that has multiple dataset fields mapped to it.
   • Test are updated to maintain 100% coverage

[rocco8773]

#20