allow zero noise

This MR allows zero noise as an option to set_data. There's a question of whether we want to avoid having to do this by giving the interferometers a sampling frequency and duration by default, in which case the additional code here is unnecessary.

@paul-lasky @moritz.huebner @gregory.ashton @marcus.lower

added 46 commits

• e8f92b28...567cf3da - 45 commits from branch master
• c23b1e0f - Merge branch 'master' into 'zero_noise'

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added 1 commit

• 002e15a1 - allow zero noise in get_interferometer_with_fake_noise_and_injection

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added 59 commits

• 002e15a1...76e321c2 - 58 commits from branch master
• 74025284 - Merge branch 'master' into zero_noise

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mentioned in commit 519994fb

merged