Add simple fit Gaussian

Makefile.am

icons/fit.png

src/Global.h

src/Makefile.am

src/Makefile.in

src/datacontainer/PropertyPlotDataContainer.cpp

src/datacontainer/PropertyPlotDataContainer.h

src/mainoffscreenplot.cpp

src/mainplot.cpp

src/manager/AnalysisRequesterManager.cpp

src/manager/AnalysisRequesterManager.h

src/manager/InterfaceManager.cpp

src/manager/InterfaceManager.h

src/manager/OffScreenPlotManager.cpp

src/manager/PlotManager.cpp

src/manager/PlotManager.h

src/manager/RequestDealerManager.cpp

src/manager/mpl/MplEventManager.cpp

src/plot/EmptyPlot.cpp

src/plot/Plot.cpp