low limit of cut-off frequency ignored in surfaceNoise
surfaceNoise ignores the fl when writting the 1/3-data of SPL and PSD. That means the data of 1/3 SPL and PSDlower than fl are still written to files. The problem can be reproduced using the vortexShed tutorials.
Link to EP:
## Reattaching the author to the issue ticket: @SonVo ##