Use LazyOuterProduct to construct multi-dimensional quadratures. This change allwed to: - Replace the types Quadrature and InverseQuadrature by functions returning outer products of the 1D operators. - Avoid convoluted naming of types. DiagonalInnerProduct is now renamed to DiagonalQuadrature, similarly for InverseDiagonalInnerProduct.

module Sbplib

include("RegionIndices/RegionIndices.jl")
include("LazyTensors/LazyTensors.jl")
include("Grids/Grids.jl")
include("SbpOperators/SbpOperators.jl")
include("DiffOps/DiffOps.jl")

export RegionIndices
export LazyTensors
export Grids
export SbpOperators
export DiffOps

end