Fix bug with parameterized heterogeneous soil layers

Brian Groenkerequested to merge
bgroenke/cryogridjulia:bugfix/multi-soil-params into master

Additionally refactors soil parameterization again...

  • Removed Nonparametric; Nothing is used to indicate nonparametric configuration.
  • Add SoilParameterization abstract type.
  • Remove ByComposition and replace ByXicePorSat with simply BySoilProperties. This parameterization is favored anyway because 1) there are no cross-parameter constraints, and 2) less intrinsic correlation between parameters.

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