fft.tar.Z contains a simple set of routines for base-2 forward and inverse
fft's. It includes a simple timing routine to test your machine speed.

timefft.c: simple-minded timing routine to repeatedly run for_fft and inv_fft
fft.c: most of the code for the forward and inverse fft functions
	(see the top of the file for a description)
bitsw.c: The bit-reversal code used with fft.c. Note that with the current
	setup, it will handle a maximum of 2^16 points, but is easily
	changed.

fft.h: change Max_gamma in here to set the maximum number of points in an
	fft (currently 2^14 = 16384 points)
