FFT for RISC for Mac

This is an FFT (Fast Fourier Transform) library which was optimized for speed on RISC processors such as the PowerPC. Most FFTs use single precision floats; for double precision, just use a global search and replace to change float options in all source files. Optimization was done using a PowerPC 8100/80 and a 1,024-point complex FFT with the CodeWarrior C compiler.