ice permittivity Cuzzi1980 added

[Rosh-2023]

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[hsignarg]

Thank you for the contribution.

Could you please add a test in test_ice.py to:

• Validate this function returns values consistent with Cuzzi et al. 1980;
• Make sure that in the future , making modifications to the code will not break this function.
  This can be added as one or two parameter sets in the parametrization of test_ice_permittivity.

Also, I believe we should keep all permittivity computations to be functions of frequency and temperature for consistency. I understand this one is valid only for T = 100K. A solution could be to set temperature = 100 as default and to return an error if temperature is too far from 100.

[Rosh-2023]

Thanks for the suggestions.
I’ve added the test case in test_ice.py and updated the function to accept temperature with a default of 100 K and return an error if temperature is too far from 100.