Fixed a bug in fls/console.py.  Password mismatch_message in get_password was not used.
wltask now asks for a password on sending a task if the user has asked to be prompted on each use.
Added a password prompt to the GUI, should the user choose to enter his password on each use.
Added some exception checking to wltask.console.mail_task.  Now reports error messages for things like the wrong password.