OpenTTD

fixed indentation and added some comments

Why are you adding a new setting instead of using the existing "town council attitude" one?
(Current values: permissive, tolerant, hostile; new value: submissive/cheating)

What is the meaning of the existing one, when disabling via the new setting?

It was just easier to add this, and I do not want to mess with other code. With this setting the rating calculation stays working, but it is not checked when destroying/building station. When adding an extra option to "town council attitude" it should completlely remove rating calculation, visiblity in "Local authorities" window and bribing function.

If it is important to not add new setting, i can submit new patch.

It's not just important, it's a hard requirement. New code must be fully integrated into the code base.

You don't want to have multiple settings to achieve one thing (eventually leading to set this option to "yes", that one to "ignore other one", and the the third one to "yes").

No, this patch don't make multiple settings to achieve one thing. It disables blocking capabilities of local authority, but no whole rating calculation.
Copy-paste from irc:
<Milek7> while disabling rating calculation, what value use in GSTown.GetRating?
<Milek7> ignoring don't breaks anything, disabling can broke something relying on that
<Milek7> and it even shouldn't be disabled, because gamescript using town rating to calculate growth is very good
<Milek7> but this patch is for that local authority can't block building/destroying
<Milek7> not disabling rating completly

I think main source of confusion here is that town_council_tolerance affects multiple things:
1) Max town noise level
2) Speed of noise level reduction with distance
3) Min rating required for demolishing stuff in town
Also, notably, it does NOT affect
4) Town rating calculation (and thus cb scripts)
5) Min rating for placing stations (that's always RATING_VERYPOOR)

And main issue with authority rating is it's blocking behavior (3 and 5).
So I'd suggest splitting airport noise in separate setting and making tolerance affect station placement.
That way adding ignorant/cheating attitude will allow to disable blocking aspect without breaking anything else.

Oh, and also ignoring 3 should be removed from magic bulldozer effects imo if this is implemented.