Configuring Display Names For Layer Manager

The STANDARD_NAME of many products coming from Satpy is too long to display well in the Layer Manager column Name. Using the configration setting standard_names it is possible to define shorter names for display:

standard_names:
  '[STANDARD NAME 1]': [DISPLAY NAME 1]
  '[STANDARD NAME 2]': [DISPLAY NAME 2]

For example, with the following configuration for reflectance_mean_all the displayed name will be REFL (mean, all), for toa_outgoing_radiance_per_unit_wavelength it will be RAD:

standard_names:
  'toa_outgoing_radiance_per_unit_wavelength': RAD
  'reflectance_mean_all': REFL (mean, all)