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Convert radiation pattern from phi/theta form to azimuth/elevation form

`pat_azel = phitheta2azelpat(pat_phitheta,phi,theta)`

`pat_azel = phitheta2azelpat(pat_phitheta,phi,theta,az,el)`

```
[pat_azel,az_pat,el_pat]
= phitheta2azelpat(___)
```

expresses
the antenna radiation pattern `pat_azel`

= phitheta2azelpat(`pat_phitheta`

,`phi`

,`theta`

)`pat_phitheta`

in azimuth/elevation
angle coordinates instead of φ/θ angle coordinates. `pat_phitheta`

samples
the pattern at φ angles in `phi`

and θ
angles in `theta`

. The `pat_azel`

matrix
uses a default grid that covers azimuth values from –90 to
90 degrees and elevation values from –90 to 90 degrees. In
this grid, `pat_azel`

is uniformly sampled with
a step size of 1 for azimuth and elevation. The function interpolates
to estimate the response of the antenna at a given direction.