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Corrected bugs in the distance_array functions of lm/gl/hp space and in HPLMTransformation and LMHPTransformation

# Conflicts:
#	lm/__init__.py
#	lm/nifty_lm.py
#	rg/nifty_fft.py

- Remove mmax. Now, lmax == mmax
- Create index and l-number on the fly

- Cython extension to return the correct l-number for an index

Revised SmoothOperator implementation.



See merge request !28

- Move kernel construction to after transform
- Use d2o.arange for distance_array method in HPSpace and GLSpace

-> A Field on a PowerSpace can now be initialized with a spectral function.

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.

- Refactor _smooth_helper
- Remove inplace property
- Rename method compute_k_array to distance_array in RGSpace
- Fix compute_k_array usage