fix: make it work with extended polars as input

If extended polars (_i.e._ polars given for [-180,180] deg) are given
as input, only look for values in the expected range of the original
polar.
- Stall should be in [0, 30] deg
- Zerolift should be in [-30, 30] deg
- Linear range for Cl should be in [-30, 30] deg

TODO:
- Fix and improve tests