Reworked auth_basic_user_file documentation. Some extra details about crypt(3) are provided, emphasizing modular crypt() usage and commonly available password hashing methods. Also, added some examples on how to use "openssl passwd" to generate password hashes, made it clear that {SSHA} passwords are not secure now, and added a note about passwords being validated on each request.

^binary/books/
^binary/download/
^gzip/
^libxslt/