exclude all interface classes from user doc

Param/Node/INode.h

Param/Node/INodeVisitor.h

Sample/Aggregate/IInterferenceFunction.h

Sample/Correlations/IPeakShape.h

Sample/HardParticle/IFormFactorPolyhedron.h

Sample/HardParticle/IFormFactorPrism.h

Sample/HardParticle/IProfileRipple.h

Sample/Lattice/ISelectionRule.h

Sample/Particle/IAbstractParticle.h

Sample/Particle/IParticle.h

Sample/SampleBuilderEngine/ISampleBuilder.h

Sample/Scattering/IBornFF.h

Sample/Scattering/IFormFactor.h

Sample/Scattering/IFormFactorDecorator.h

Sample/Scattering/ISampleNode.h

auto/Wrap/doxygenCore.i

auto/Wrap/doxygenDevice.i

auto/Wrap/doxygenParam.i

auto/Wrap/libBornAgainParam.py

auto/Wrap/libBornAgainParam_wrap.cpp