Superfluous warning when elevation is equal to 90 degrees

[MomentusScott]

ITU-Rpy/itur/models/itu676.py

Line 299 in e69587f

if np.any(5 > el) or np.any(np.mod(el, 90) < 5):

When calling gaseous_attenuation_approximation with an elevation angle of 90 degrees, this warning is thrown:

The approximated method to compute the gaseous attenuation in recommendation ITU-P 676-11 is only recommended for elevation angles between 5 and 90 degrees

First, 90 degrees is between 5 and 90 degrees (for the closed interval), so the conditional is inconsistent with the warning. Second, Annex 2 of ITU-R P.676-13 should work for 5 <= el <= 175 degrees, since sin(theta) is symmetric around 90deg.