AB_LoadDataWrapper is case-sensitive for wave objects to load

[MichaelHuth]

This is an Igor Pro bug, workaround is to use /GREP with "(?i)..."

Correction: LoadData/L works fine. However, we need a "(?i)" for the regexp at the end of the function, otherwise we filter the wave names out, because the loaded waves have a different casing as the input list elements.