add the function of call python program

1, on beginning, use linx popen function, this will led the main UI process to wait the subprocess, and the UI will be unuseable until the subprocess finished.
2, then I choose the QProcess Class to replace the popen, I find this class is very convenient, is atomatic asyc, and have a signal function named "finished" which can be used as a slot function to inform the parent.
3, and a few changes to UI.