MueLu: delete ShiftedLaplacian interface?

[jhux2]

Would anyone object if I delete the ShiftedLaplacian interface? I know of no current users. The interface isn't maintained, and takes well over 5 minutes to compile.

@trilinos/muelu

[cgcgcg]

Instead of outright deleting it, maybe just don't compile it by default? Or is it actually broken?

[jhux2]

Instead of outright deleting it, maybe just don't compile it by default? Or is it actually broken?

It's not broken, as the Helmholtz tests exercise the interface, but it's badly in need of a redesign. One option would be to guard it with an experimental flag.

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[jhux2]

closing as fixed by PR #3047.