rewritten FFTW interface
update dsp.jl to use new fft API
whoops, fft! in-place functions only work on complex arrays
update extras/image.jl to use new fft API
bugfix, test cases for FFTs of subarrays
Merge branch 'master' of git://github.com/JuliaLang/julia into new_fftw
update FFT docs
in brfft, d can be any integer, not just Int
define FFT functions for scalars (where they are just the identity)
Merge pull request #1856 from stevengj/new_fftw

RFC: rewritten FFTW interface