This is mostly infrastructural code (Opm::Spline,
Opm::TriDiagonalMatrix, property system and the cubic polynomial
inversion code) that is only used by opm-material and eWoms. The
original intention of bringing this code into opm-core was to allow
other modules to start to use this easily. Since nothing in this
direction happened during the last one and a half years, the code only
represents baggage in the opm-core context and should thus be moved to
their consumer modules to make the life of everyone involved simpler.
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