mac portaudio dependency fix
Hi Emil, Invert in WaveSurfer (which is available under the Transform menu) refers to flipping the sign of the samples in the waveform. This is the same meaning as in other audio editing software (e.g. Audacity). I'm guessing that you are thinking of some other kind of inversion such as acousitc-articulatory inversion of speech waveforms. I don't think it is claimed anywhere that WaveSurfer can do that?
updated README
MacOS 10.15: 64-bit binary, added Snack source code + build system, TclTk download + build script
new macos runtime: tcl8.6.8
fixed subtle bug related to opening file in untouched widget
added linux dependency libXft.so (seems to be n...