Feature #284: === Fit ===
FitParameterLinked causes weird coupling
|Status:||Rejected||Start date:||01 Aug 2016|
FitParameterLinked inherits from FitParameter.
However, its member m_pool_parameters is of type vector<RealParameter*>.
So FitParameterLinked sits somewhere in between Fit/ (with class FitParameter) and Core/ (with class RealParameter).
Can it be entirely moved to the one or the other side?