(version): Bump version number to 1.5.
(longopts): Add -c, -C, -e, -E, -p, -P options.
(opts): Ditto.
(PrintPW): Print values of UF_PASSWD_CANT_CHANGE and
UF_DONT_EXPIRE_PASSWD flags. Slightly reformat output. Don't suppress
correct system password settings just because the account has admin
privileges.
(usage): Define as "noreturn" function. Restructure and rephrase
output. Accomodate new options.
(print_version): Fix copyright dates.
(main): Accomodate new options for setting UF_PASSWD_CANT_CHANGE,
UF_DONT_EXPIRE_PASSWD and UF_PASSWD_NOTREQD settings.
1f4e5e1571