alefcastelli

Missing field `ext` in some structures

2

The structures `Area`, `LoadZone` and `Arc` do not have the `ext` field present. Please add it and check if there are other structures needing this addition. This will be needed...

afc/ward decomposition for embedded HVDC

1

Thanks for opening a PR to PowerNetworkMatrices.jl, please take note of the following when making a PR: Check the [contributor guidelines](https://nrel-sienna.github.io/PowerNetworkMatrices.jl/stable/code_base_developer_guide/developer/)

consider changing the "sparsify" function (invoked when argument "tol" of PTDF is set) in the following way: -get the ptdf.data -data = sparse(ptdf.data) -data.nzval[abs.(data.nzval)