now multidomain has size property

See merge request ift/nifty-dev!134

removed restriction that forces padding to be in position space

See merge request ift/nifty-dev!132

Improvements to the Getting Started 3 Demo

See merge request ift/nifty-dev!129

Default codomain sugar

See merge request ift/nifty-dev!115

Add clipped_exp

See merge request ift/nifty-dev!128

results.png: make KL.position and MOCK_POSITION power spectra lines
thicker so they are clearly identifiable.

loop.png: do not overwrite the intermediary loop plot, save one
for each iteration

Sample more often to make better use of the computation time.
Beforehand, when starting from zero, convergence was far from
reached in the time the demo ran, while much time was used
to optimize for the initial samples.

introduce CG resetting

See merge request ift/nifty-dev!125

Interpolated inverse gamma

See merge request ift/nifty-dev!127