Inverse gamma

See merge request ift/nifty!416

No DiagonalOperator if ScalingOperator is fine

See merge request ift/nifty!407

Mightier operators

See merge request ift/nifty!414

Gig energy

See merge request ift/nifty!411

Simplifications

See merge request ift/nifty!410

Fix FieldZeroPadder

See merge request ift/nifty!408

Adapt the ScalingOperator class to not depend on sugar.py in order to
use it within sugar.py without getting a circular dependency.

Where applicable, use a ScalingOperator instead of a DiagonalOperator.

getting_started_mf cleanup

See merge request ift/nifty!404

fix NIFTy 5 ASCL citation

See merge request ift/nifty!405

README: add build instructions for docs

See merge request ift/nifty!406

Introduce `nifty6.mpi` namespace

See merge request ift/nifty!395

Scalable energies2

See merge request ift/nifty!402

reverted changes in linearOperator, put changes in scalingoperator instead, fixed bugs and wrote tests:

operator.py: Raise not-implemented in matmul call

See merge request ift/nifty!403

Gordian Edenhofer authored Jan 23, 2020 and Martin Reinecke committed Jan 23, 2020

Contrary to other overloaded operators, the `__matmul__` call apparently
needs to raise an exception instead of returning `NotImplemented`. This
behaviour can be seen for example in:

```python
psp = ift.RGSpace(512)
m = ift.MaskOperator(ift.Field.from_raw(psp, np.random.randint(0, 2, 512)))
m(ift.from_random("normal", m.domain).val) is NotImplemented
```

which should be invalid and raise an exception but previously returned
`True` instead.