instrument_ant_* --> instrument_tel_*

[mservillat]

This is a proposition to change a few names based on "antenna", that could be based on the more general concept of "telescope", so instrument_ant_* --> instrument_tel_*

The benefit is that a few of those keywords could then be useful for other domain, e.g. for Cherenkov Telescope arrays ;-) or interferometers in general.

[kettenis]

We discussed this during the Radio IG session of the Malta interop and it seems that even for aperture/phased array telescopes this renaming would be sensible.

[Bonnarel]

We discussed this during the Radio IG session of the Malta interop and it seems that even for aperture/phased array telescopes this renaming would be sensible.

In that case I can change ant to tel in the PR currently discussed