MATH-389
Duplicate code in "MultivariateRealOptimizer" and
"DifferentiableMultivariateRealOptimizer" moved to new interface
"BaseMultivariateRealOptimizer".
New "AbstractScalarOptimizer" superclass allow implementations that do not
use derivatives.
Deprecated "protected" fields.
"NonLinearConjugateGradientOptimizer" changed to make use of the newly
added accessors instead of the "protected" fields.
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