JobResultPresenter now recognizes JobItem valid for fitting and adds FitComparisonWidget to the list of available presentations.

New FitComparisonWidget (intended for real data/ simulated data comparison) is connected with JobResultsPresenter.

JobOutputDataToolBar is removed in the favor of new dynamic action list generation enclosed in SessionItemWidget.

New SessionItemWidget to be the base of all widgets having setItem interface and dynamic list of corresponding actions.

Replaced obscure build() functions with template create_new, now that return type covariance is working

Current values of fit parameters in the course of the fit are propagated via ProgressInfo mechanism now.

Signal/slot renaming between FitSuiteWidget and GUIFitObserver to better describe what is flying around.