store the dense Uπs, sparsify at read-time

src/Orbit-wise.jl

@@ -38,7 +38,8 @@ function OrbitData(sett::Settings)
    splap² = GroupRings.mul!(splap², splap, splap, pm);
 
    # Uπs = load(joinpath(name, "U_pis.jld"), "Uπs");
-   Uπs = load(joinpath(prepath(sett), "U_pis.jld"), "spUπs");
+   Uπs = load(joinpath(prepath(sett), "U_pis.jld"), "Uπs")
+   Uπs = sparsify!.(Uπs, sett.tol, check=true, verbose=true)
    #dimensions of the corresponding πs:
    dims = load(joinpath(prepath(sett), "U_pis.jld"), "dims")
 

src/OrbitDecomposition.jl

@@ -218,7 +218,6 @@ function compute_orbit_data{T<:GroupElem}(logger, name::String, G::Nemo.Group, S
 
    save(joinpath(name, "U_pis.jld"),
          "Uπs", Uπs,
-         "spUπs", sparsify!.(deepcopy(Uπs), check=true, verbose=true),
          "dims", dimensions)
    return 0
 end