SUIFFT - fft complex frequency traces to real time traces
suiftt sdout sign=-1
Required parameters:
none
Optional parameter:
sign=-1 sign in exponent of inverse fft
Output traces are normalized by 1/N where N is the fft size.
Note: sufft | suifft is not quite a no-op since the trace
length will usually be longer due to fft padding.
Credits:
CWP: Shuki, Chris, Jack
Trace header fields accessed: ns, trid
Trace header fields modified: ns, trid