https://github.com/fredRos/pyFFTW/issues/8
https://github.com/fredRos/pyFFTW/issues/9

Added dtype option to prober.

See merge request !169

Revert "added some distribution_strategy's for mpirun, fixed some errors in WienerFilterEnergy"

See merge request !167

This reverts commit 03cc7f7e

avoid exec statements; they cause problems with Python 3

See merge request !165

Branch master

See merge request !164

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

Index games2

See merge request !163

# Conflicts:
#	test/test_spaces/test_power_space.py

# Conflicts:
#	nifty/spaces/power_space/power_indices.py
#	test/test_spaces/test_power_space.py

fix demos

See merge request !162

Working on demos

See merge request !120

suggested fix for stopping criterion

See merge request !161

fix field.vdot

See merge request !160