Final cleanup in python examples

...tting/ex01_SampleParametersIntro/SampleParametersIntro.py

...simulation/ex01_BasicParticles/AllFormFactorsAvailable.py

...simulation/ex03_InterferenceFunctions/ApproximationLMA.py

...simulation/ex04_ComplexShapes/LargeParticlesFormFactor.py

...mulation/ex04_ComplexShapes/ParticlesCrossingInterface.py

.../python/simulation/ex05_BeamAndDetector/BeamDivergence.py

.../simulation/ex05_BeamAndDetector/OffSpecularSimulation.py

...on/simulation/ex05_BeamAndDetector/RectangularDetector.py

...hon/simulation/ex05_BeamAndDetector/SpecularSimulation.py

...mulation/ex06_Miscellaneous/AccessingSimulationResults.py

...on/simulation/ex06_Miscellaneous/BoxesWithSpecularPeak.py

Tests/Functional/PyCore/persistence/example_template.py

Wrap/python/plot_utils.py