Sfonxu

Results 7 issues of Sfonxu

Implementation based on Twomey (1959) [https://doi.org/10.1007/BF01993560] and Twomey, Wojciechowski (1969)[https://doi.org/10.1175/1520-0469(1969)262.0.CO;2]

This PR is a first in series of PRs of API refactoring described in #510. The aim is to replace repeated definitions of ``interpolate`` around the code to a single...