Quantum noise uses test mass susceptibility for SQL strain

• The quantum noise calculation uses the test mas susceptibility instead of the free mass approximation in shotradSignalRecycled.
• The free mass approximation is still used in shotradSignalRecycledBnC and the functions in squeeze.py.
• The noise differences are unsurprisingly at the suspension resonances.

Closes #93 (closed).

added noise label

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approved this merge request

mentioned in commit 061a6da8

merged