Merge branch 'fix_performance_test_generality' into 'NIFTy_7'

Fix performance test applicability for operators with limited domain

See merge request !635
14 jobs for NIFTy_7 in 26 minutes and 52 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Static Checks
passed check_no_asserts #1341755

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  Build Docker
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  Test
passed test_mpi #1341763

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passed test_serial #1341761

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  Demo Runs
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passed run_curve_fitting #1341781

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passed run_getting_density #1341777

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passed run_getting_started_1 #1341769

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passed run_getting_started_2 #1341771

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passed run_getting_started_3 #1341774

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passed run_getting_started_mf #1341776

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passed run_ipynb0 #1341765

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passed run_ipynb1 #1341767

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passed run_visual_vi #1341782

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