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Martin's monster merge part 4/N: revamp dependencies, switch to pyHealpix

See merge request !67

Refactored **transformation.py classes and FFTOperator. Especially fixed RGRGTransformation.check_codomain.

# Conflicts:
#	nifty/spaces/lm_space/lm_space.py

Martin's monster merge part 3/N: rework tests to avoid npz files

See merge request !66

Martin's monster merge part 2/N: partial de-cythonization

See merge request !65

Martin's monster merge part 1/N: (hopefully) uncontroversial bits

See merge request !64

This reverts commit 01082932.

improve grid size checks for GL

See merge request !56

This reverts commit baf3a7b8, reversing
changes made to 8ce837d0.