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If the dtype of the codomain != dtype of result field, information is lost due to conversion complex -> float.

Fixed a few small bugs.

- Refactor RGRGTransformation
- Add is_local to dictionary key hash

Removed NIFTy 2 files that have not been ported so far.

Fixed a bug in fft_operator.
Fixed a inconsistency in GFFT interface.

Reordered methods in space classes.
Made Space.weight to an abc.abstractmethod.

- Add get_default_codomain function in utilities
- Move all transforms to a subfolder inside the fft_operator
- Correct weight method calls in transform method of each transformation

- Create skeleton for TransformationOperator
- Minor bug fixes in Field, FFTTransform and RGRGTransformations and
  __init__.py for endomorphic_operator

Adapted imports and setup.py to changes.

- rename transforms submodule to transformations
- Add a Transformation class which wraps the actual transform class
- Derive and implement RGRGTransformation
- Add tests

- Merge _get_transform_override and _get_transform
- Move check_codomain for rg_space to Transform as a staticmethod
- Add tests for transforms

Added multithreading to fftw module.

Condensed functional structure in nifty_fft.py.

- Refactor based on discussion on 08.06
- Add test for FFTW transform

- Refactor transform() according to discussions
- Add checks for validity of axes

- Move the transform logic to its own method
- Refactored the _fftw_plan_and_info to FFTWTransformInfo