all: remove useless namespace bp::

include/eigenpy/angle-axis.hpp

include/eigenpy/copyable.hpp

include/eigenpy/decompositions/EigenSolver.hpp

include/eigenpy/decompositions/LDLT.hpp

include/eigenpy/decompositions/LLT.hpp

include/eigenpy/decompositions/SelfAdjointEigenSolver.hpp

include/eigenpy/decompositions/minres.hpp

include/eigenpy/eigen-to-python.hpp

include/eigenpy/fwd.hpp

include/eigenpy/geometry-conversion.hpp

include/eigenpy/numpy-type.hpp

include/eigenpy/quaternion.hpp

include/eigenpy/register.hpp

include/eigenpy/registration.hpp

include/eigenpy/solvers/BFGSPreconditioners.hpp

include/eigenpy/solvers/BasicPreconditioners.hpp

include/eigenpy/solvers/ConjugateGradient.hpp

include/eigenpy/solvers/IterativeSolverBase.hpp

include/eigenpy/solvers/LeastSquaresConjugateGradient.hpp

include/eigenpy/solvers/SparseSolverBase.hpp