It should be easy to enter a password into osso-xterm without
the password ending up in the input history.
Attached is a patch that adds a "Terminal->Enter Password..."
menu item which launches a dialog for entering a password.
The password is then sent to the active window, along with a newline.
Possible enhancements not in this patch:
1) Keep the input entry area open (popping up the dialog closes it until
the user clicks in the text area).
2) Make the newline after the password configurable (although I think it's desired 99% of the time)
3) Put a button in the toolbar to pop up this dialog
