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- get_slice_list returns the entire shape when axes is None
- GFFT.transform() is now a single for-loop
- Input array is simply cast to codomain's dtype
- Other formating changes were included/reverted

- GFFT.transform() now returns data cast to codomain's dtype
- Remove cast to codomain from rg_space.calc_transform()

- GFFT now uses get_slice_list to get slices to iterate over all axes

Slice list iterator



See merge request !12

- GFFT now checks if the axes keyword is provided and only applies FFT to those axes.

- Rename FFT classes so that they follow PEP8 naming conventions. The following classes have been renamed:
    - fft -> FFT
    - fft_fftw -> FFTW
    - fft_gfft -> GFFT
- Add docstrings for new arguments and for the old ones missing one
- Add axes keyword to rg_space.calc_transform()
- More PEP8 fixes in nifty_fft
- GFFT's transform method now uses paradict instead of para

- Reformat code according to PEP8
- Add 'axes' keyword to transforms of both FFT machines.

fix tests for overflow errors



See merge request !11

# Conflicts:
#	test/test_nifty_mpi_data.py

Added a _selective_allreduce method to the slicing distributor in order to fix contractions that involve nodes with empty data.

Minor fixes for axis



See merge request !10

Merge branch 'add_axis_keyword_to_d2o' of gitlab.mpcdf.mpg.de:ift/NIFTy into add_axis_keyword_to_d2o

Tests for axis



See merge request !9