rm postfix _at_bottom from formfactor fcts

Examples/fq/Sphere.py

Examples/scatter2d/CustomFormFactor.py

Resample/Particle/ReParticle.cpp

Resample/Particle/ReParticle.h

Sample/HardParticle/Box.cpp

Sample/HardParticle/Box.h

Sample/HardParticle/Cone.cpp

Sample/HardParticle/Cone.h

Sample/HardParticle/Cylinder.cpp

Sample/HardParticle/Cylinder.h

Sample/HardParticle/EllipsoidalCylinder.cpp

Sample/HardParticle/EllipsoidalCylinder.h

Sample/HardParticle/HemiEllipsoid.cpp

Sample/HardParticle/HemiEllipsoid.h

Sample/HardParticle/HorizontalCylinder.cpp

Sample/HardParticle/HorizontalCylinder.h

Sample/HardParticle/IFormFactorPolyhedron.cpp

Sample/HardParticle/IFormFactorPolyhedron.h

Sample/HardParticle/IFormFactorPrism.cpp

Sample/HardParticle/IFormFactorPrism.h