FEAT: make ParameterFlattener
public
#546
Open
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Closes #545
As it is not unusual to have optimizers (like Minuit) that only work with real numbers and process the real and imaginary parts of complex values seperately, the utility-class
ParameterFlattener
should be exposed by the framework as its functionality would have to be reproduced by any user using an optimizer which is not already cared for by the framework itself.