This commit introduces a new helper structure, RawFunctionValues,
which collects unscaled saturation function values that are needed
for vertical scaling of saturation functions using keywords such as
KRO, KRORG, KRGR, PCW
and their hysteretic and directional counterparts. We also
introduce a new helper function, getRawFunctionValues, which
extracts those values from the function tables in TableManager.
Add a set of unit tests to exercise the new feature.