Modified greeter to clear out the password field after a failed logon attempt
Prevented the SIGPIPE signal from terminating the process.  SIGPIPE is a normal signal when utilizing named pipes for interprocess communication.
The SwitchTo task should not be altering the session state.
Prevented the LogonUser entry point from getting called if the username is empty.
Minor modification to X11 module.
Fixes to auth session when user cannot be authenticated via RDP.