cosmetic changes
first commit of files for KTHDF5TypeWriterFFT
include writer
first stab at writing the polar frequency spectrum
add a function to setup the typewriter based on the header.  we need the
slice size and so on.
now writes polar FFT spectra (full abs + arg format)
add processing of egg header plus necessary buffers to write polar FFT
data.
debug message for opening file.
now writes complex frequency spectra also
move most of the dataset creation logic into a generic function that is called
by the specialized dataset creation functions.
now one generic function handles all of the dataset creation logic.
add declarations for polar power spectrum calculation
implement polar power spectrum writing
implement FFTW power spectrum calculation and writing
now calculates and writes FFTW power spectra