Planned maintenance on Wednesday, 2021-01-20, 17:00-18:00. Expect some interruptions during that time

Merge branch 'master' into fight_the_power

# Conflicts:
#	nifty/field.py
#	nifty/sugar.py
4 jobs for fight_the_power in 6 minutes and 29 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #185286
test_min

00:02:30

passed #185287
test_mpi

00:04:32

passed #185288
test_mpi_fftw

00:05:15

passed #185289
test_mpi_fftw_hdf5

00:06:29

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