Fft makeover

[Jellevanderwerff]

In order:

• power is now returned (ff44117)
• dc offset removal has been added as an argument that defaults to True (offset removed; 41cbc1f)
• Nyquist was already implemented of course
• I don't see a difference between the two options actually.

[Jellevanderwerff]

Can be merged (despite test failing, which is to do with an unrelated issue)

[YannickJadoul]

Huh, sorry, I pulled this and rebased, but something must have gone wrong. Figuring out what went wrong!

[YannickJadoul]

Ah, I think I didn't fetch before :-|
Cleaning up!

[YannickJadoul]

OK, back from the depths of git.

Note, still rebased onto main with passing tests.
So update your local branch with git pull --rebase or git reset --hard origin/fft_makeover, @Jellevanderwerff!

[YannickJadoul]

LGTM!
Couple of suggetsions, but nothing crucial apart from the "first even not at time 0" note