prefer explicit lattice c'tor in Py code

...erferenceFunctions/Interference2DCenteredSquareLattice.py

...nterferenceFunctions/Interference2DLatticeSumOfRotated.py

...nterferenceFunctions/Interference2DSquareFiniteLattice.py

...ex03_InterferenceFunctions/Interference2DSquareLattice.py

...ulation/ex03_InterferenceFunctions/SpheresAtHexLattice.py

...lation/ex06_Reflectometry/MaterialProfileWithParticles.py

...on/simulation/ex07_Miscellaneous/BoxesWithSpecularPeak.py

.../simulation/ex07_Miscellaneous/CylindersInAverageLayer.py

...lation/ex07_Miscellaneous/HalfSpheresInAverageTopLayer.py

Sample/Aggregate/InterferenceFunctionFinite2DLattice.cpp

Sample/Aggregate/InterferenceFunctionFinite2DLattice.h

auto/Wrap/doxygenSample.i

auto/Wrap/libBornAgainSample.py

auto/Wrap/libBornAgainSample_wrap.cpp