[Users] Remove default variable guess from Multipole

[Roland Haas]

Hello all,

> I think it might cause a little confusion and breaks the
> orthogonality of the design of the various thorns.  I would prefer to
> leave the default as it is now, i.e. an empty list of variables,
> rather than couple it to WeylScal4, which is an unrelated (except by
> common use) thorn.  Of course, this isn't a hugely important point,
> so If there is strong support for Roland's suggestion, I would accept
> the view of the majority :)
Either option is fine by me.

I think having Parameter files that actually mention the variable that
is acted on is not a bad idea after all. It seems as if there are only
AHFinderDirect (uses Spacemask) and SetMask_SphericalSurface (uses
HydroBase::hydro_excision_mask) that mention other thorn's GF in their
parameter file. Since Multipole is an infrastructure thorn it probably
makes sense for it *not* to refer to the specific physics thorn
WeylScal4. I retract my suggestion of a default value :-)

Yours,
Roland


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