Merge branch 'fix_op_expm1' into 'NIFTy_5'

Define `log1p` and `expm1` as acting on OP-chains

See merge request !376
11 jobs for NIFTy_5 in 24 minutes and 41 seconds (queued for 3 seconds)
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test_mpi

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test_serial

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  Release
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pages

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run_bernoulli

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  Deploy
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