Comment (by Samuel Cupp):

@Roland Haas In regards to deprecation, correct me if I’m wrong: the best approach to merge the two thorns is to
A) Introduce the extra stuff to SMF to allow for BNS as well
B) Ensure the default behavior of Seed_Magnetic_Fields (SMF) is as before
C) Add deprecation warning for SMF_BNS thorn
D) In the release after the one where this is added, remove the SMF_BNS thorn entirely

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2742/change-seed_magnetic_fields-scheduling-so