Display more of the user's password

Reversed the order of the pwmod date and the password itself.
The number of chars of the user's password displayed depends on the
terminal width. e.g. on an 80 column terminal, 18 chars will be
displayed. If the user's password is longer than what can be displayed,
this is indicated with a trailing "..". Wider displays (e.g. 132 column)
can display all 40 chars of a user's password.

This fixes issue #442

When passwords aren't displayed (due to sysop configuration), show
"<hidden>" instead of "XXXXXXXX" to make that more clear.