docs: def change_WD(self, new_WD, meas_file=""):
          """
          Changes Demag GUI's current WD to new_WD if possible
  
          Parameters
          ----------
          new_WD : WD to change to current GUI's WD
          """
          new_WD = os.path.abspath(new_WD)
          if not os.path.isdir(new_WD):
              return
          self.WD = new_WD
          if not meas_file:
              if self.data_model == None:
                  if os.path.isfile(os.path.join(self.WD, "measurements.txt")) and os.path.isfile(os.path.join(self.WD, "magic_measurements.txt")):
                      ui_dialog = demag_dialogs.user_input(self, ['data_model'], parse_funcs=[
                                                           float], heading="More than one measurement file found in CWD with different data models please input prefered data model (2.5,3.0)", values=[3])
                      self.show_dlg(ui_dialog)
                      ui_data = ui_dialog.get_values()
                      self.data_model = ui_data[1]['data_model']
                  elif os.path.isfile(os.path.join(self.WD, "measurements.txt")):
                      self.data_model = 3.0
                  elif os.path.isfile(os.path.join(self.WD, "magic_measurements.txt")):
                      self.data_model = 2.5
                  else:
                      self.user_warning(
                          "No measurement file found in chosen directory")
                      self.data_model = 3
              try:
                  self.data_model = float(self.data_model)
                  if int(self.data_model) == 3:
                      meas_file = os.path.join(self.WD, "measurements.txt")
                  elif int(self.data_model) == 2:
                      meas_file = os.path.join(self.WD, "magic_measurements.txt")
                  else:
                      meas_file = ''
                      self.data_model = 3
              except (ValueError, TypeError) as e:
                  self.user_warning(
                      "Provided data model is unrecognized or invalid, assuming you want data model 3")
                  self.data_model = 3
  
          if os.path.isfile(meas_file):
              self.magic_file = meas_file
          else:
              self.magic_file = self.choose_meas_file()
  
          if not self.data_model:
              self.data_model = 3