Fixed getpw_last_changes (still including debug code).
getpw_last_changes: Removed debug echoes.
getpw_last_changes: Nicer output, two levels. Closes #4.
randgen: Reduce length, increase character pool.
getpw_last_changes: Sort output, oldest accounts on top.
getpw_last_changes: Warn after 3 months, critial after 6 months.