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$Header$
Things to do on this thorn:
- support excision, i.e. there should be a way to tell the interpolator
about an excision mask, and either
* have it return an error if the default-centering interpolator molecule
would use data from an excised region, or preferably
* properly implement the excision_off_centering_tolerance
and excision_extrapolation_tolerance parameters as
documented in the thorn guide
- make casts from datatype to CCTK_REAL explicit in
GeneralizedPolynomial-Uniform fetch routines
- clean up the horrible inefficiency of the Hermite interpolator
(cf Erik Schnetter's E-mails and CactusBase/1366)
- allow scalar boundary_{off_centering,extrapolation}_tolerance
values in the parameter table (to mean using this value for each ibndry)
- maybe change the defaults so off-centering is forbidden unless
the user explicitly asks for it to be allowed?
- implement a "silent" parameter like in PUGHInterp?
alternatively, print warning msgs for some error returns?
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