Logout the current user Add code to the logout button to remove the current user from the session and to redirect the browser window to the login page. Part of flys/issue916 (Logout: "Abmelden" Knopf mit Funktion belegen)

SYMBOLSET
SYMBOL
  NAME 'point'
  TYPE ELLIPSE
  POINTS
    1 1
  END
  FILLED TRUE
END
SYMBOL
  NAME "square"
  TYPE VECTOR
  POINTS
    0 0
    0 1
    1 1
    1 0
    0 0
  END
  FILLED TRUE
END
END