encryption algorithm is chosen for the passwords. Document the new
-c and -s options. Add a reference to login.defs(5).
* man/login.defs.5.xml: Document the ENCRYPT_METHOD,
MD5_CRYPT_ENAB, SHA_CRYPT_MIN_ROUNDS, and SHA_CRYPT_MAX_ROUNDS
variables.
* etc/login.defs: Indicate that MD5_CRYPT_ENAB is deprecated.
Document the relationship with PAM for MD5_CRYPT_ENAB and
ENCRYPT_METHOD.