This version is object oriented, the interactive mode is now ready and seems to work. It requires more testing though. In anycase tests have to be added. myTool may also be removed, and another class MyCanvasToPrint may be created instead of the print2file function. MyWin.py should be commented and a header is needed, as well as a correction of the other headers. remarks: the default value of fignum may be removed and set to -1 hard coded (indeed another number may lead to truble in interactive mode)