major upgrade
major upgrade

-- class
    -- SaveData : add app parameter to indicate source application
    -- FitModels
        -- add polynomial fit model
        -- add optional input parameters, like:
            -- 'n': highest order for polynomial fit model
            -- 'xmin': xmin of fitting range
            -- 'xmax': xmax of fitting range
        -- modify fit_report()
    -- AnalysisPlotPanel:
        -- if fit report has word 'nan', return report as None
    -- ScanPlotPanel:
        -- inherited from AnalysisPlotPanel
        -- add new methods to handle errorbar plot

Archman/felapps,Archman/felapps,Archman/felapps