Merge branch 'newton' into 'master'

Added RelaxedNewton globally to NIFTy.

See merge request !50
5 jobs for master in 21 minutes and 26 seconds (queued for 6 minutes and 15 seconds)
Status Job ID Name Coverage
  Test
failed #127272
test_min

00:04:45

failed #127273
test_mpi

00:10:20

failed #127274
test_mpi_fftw

00:11:08

failed #127275
test_mpi_fftw_hdf5

00:13:08

 
  Release
skipped #127276
release_image_master
 
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test_mpi_fftw_hdf5 Test There is an unknown failure, please try again
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test_mpi_fftw Test There is an unknown failure, please try again
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test_mpi Test There is an unknown failure, please try again
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failed
test_min Test There is an unknown failure, please try again
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