PFFT: compute local block size for arbitrary rank
PNFFT: c2c PNDFT
PNFFT: add new tests with PNDFT
Merge branch 'master' into ndft
PNDFT: work in progress
PFFT: prepare for PNDFT
PNFFT: c2c-PNDFT works
pnfft: fix init_x_3d_adv

would always produce x > x_max
pnfft: tests: use pnfft_init_x_3d{,_adv}
pnfft: allow tests to be run from any directory
pnfft: add function for debug printing
pnfft: store fourier coefficients as R*
pnfft: store pfft input as R*
pfft: add apr_real_3d for printing real 3d-arrays
pnfft: add apr_real_3d for printing real 3d-arrays
pnfft: simple test: for c2r
pnfft: add test to check c2r error
pnfft: add define for c2r transform
pnfft: C2R
pnfft: test_adv_c2r: make local_M big enough for c2r