pyfftw updated their scipy_fftpack interface to rfft and irfft,
making it consistent with scipy's array ordering.

previously it used numpy ordering
Merge pull request #9 from aberndsen/pyfftw

cleaner switch to pyfftw (than the previous pull request)
Measure rms in lofar channels, as a first step towards compression
Add Ue-Li's nibble fortran implementations
Add PSR B1957+20 ephemeris
Trial for better effelsberg folding