Add 3DBA

Adds 3dBA to the noise values for the current alternative for all active calculation points. 

Find it here:

MOUS_ICO Menu: Noise > Calculation points > Add 3dBA

The addition is added to both Lequ, Lnight, Lmax, and Lden. The contribution from reflection is set to 3dBA.

Notes: This function is only meant for completely exceptional cases and implies the risk of some pitfalls:

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