Examples: follow pylint style advice, ctd

Examples/fit55_SpecularIntro/FitWithUncertainties.py

Examples/fit55_SpecularIntro/PolarizedSpinAsymmetryFit.py

Examples/scatter2d/CorrelatedRoughness.py

Examples/scatter2d/MesoCrystal.py

Examples/specular/AlternatingLayers.py

Examples/specular/BeamAngularDivergence.py

Examples/specular/BeamFullDivergence.py

Examples/specular/TOFRWithResolution.py

Examples/specular/TimeOfFlightReflectometry.py

Examples/varia/FootprintCorrection.py

Examples/varia/MaterialProfile.py

Examples/varia/SpecularSimulationWithRoughness.py