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Lm space complex transforms v2



See merge request !27

Started to consolidate the code base of LM <-> GL/HP transformations.

compute_k_array is still missing.

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

# Conflicts:
#	nifty/field.py

Modified power_analyze in Field for complex power spectra.

Fix normalization in FFTOperator



See merge request !24

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

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

Fixed violation of LSP for implemented keyword/property.

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

Moved unitary property to LinearOperator.

TransformationOperator



See merge request !23

- 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

Restructured new operator classes -> Introduced endomorphic_operator.py in order to avoid violation of Liskov's SP for square- and diagonal operator.
Removed paradict from operators.
Added from_random as static method to Field.

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

Refactor spaces to match Space specification

Remove all functionality not provided by spaces from all the space classes. Also, move space-specific attributes to the paradicts.

See merge request !21