interactive integration; new user-defined fit functions reloads model list; fixed requirements.txt

src/gui_qt/lib/pg_objects.py

@@ -274,7 +274,6 @@ class PlotItem(PlotDataItem):
             self.scatter.hide()
 
     def set_symbol(self, symbol=None, size=None, color=None):
-        print(symbol, type(symbol), isinstance(symbol, SymbolStyle))
         if symbol is not None:
             if isinstance(symbol, int):
                 self.setSymbol(SymbolStyle(symbol).to_str())