eval expression reuses ListWidgetItems of datasets; closes #31

src/gui_qt/main/mainwindow.py

@@ -944,7 +944,6 @@ class NMRMainWindow(QtWidgets.QMainWindow, Ui_BaseWindow):
     def extend_fit(self, sets: list):
         w = FitExtension(self)
         res = w.exec()
-        print(res)
         if res:
             p = w.values
             x = linspace(p[0], p[1], num=p[2])