[request] Add YesNo Popup dialog

Suggest adding a standard interface for prompting the user Yes/No questions. this would be implemented similarly to the input interface.

The following jython snippet has worked for me:

from javax.swing import JOptionPane;

def YesNoPopup(msg="",title=""):
    rtn = JOptionPane.showConfirmDialog(None,msg,title,JOptionPane.YES_NO_OPTION);
    if rtn == JOptionPane.YES_OPTION :
        return True
    else:
        return False

def YesNoPopup_TEST():
    if YesNoPopup("my msg","my title") is True:
        print "you hit yes"
    else:
        print "you hit no"