Harmonize TNSAnalysis*_fx(), DetectTnsFilt*_fx()

Bug description

At the first glance it looks that the function pairs

• TNSAnalysis_fx() and TNSAnalysis_ivas_fx()
• DetectTnsFilt_fx() and DetectTnsFilt_ivas_fx()

could be harmonized. It seems that the ivas-variants are a super-set of both pairs, and at the first glance I couldn't spot differences in the arithmetics or precisions.

Please rename the resulting functions

• TNSAnalysis_fx()
• DetectTnsFilt_fx()