Merge branch 'simplify_for_const' into 'NIFTy_5'

Simplify for const

See merge request !295
11 jobs for NIFTy_5 in 19 minutes and 22 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build Docker
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  Test
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passed test_serial #756249

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  Release
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  Demo Runs
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passed run_curve_fitting #756257

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passed run_getting_started_1 #756253

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passed run_getting_started_2 #756254

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passed run_getting_started_3 #756255

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passed run_ipynb #756252

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  Deploy
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