Update from version 2.03nb1 to 2.04.

Upstream changes:

2.04 - Fri Nov 28 15:41:33 PST 2008
      Incorporated bug fix for authen_ses_key() provided by
      Carl Gustafsson. authen_ses_key() was not properly handling
      any extra_session_info - the fix is to get $hashed_string with
          my $hashed_string = pop @rest;

      Also releasing the work done between April 26, 2005 and February 4, 2007,
      plus bug fix for authen_ses_key
      - Added basic framework for unit tests.
      - Factored out some of the DBI code into new methods:
        - _dbi_connect()
        - _get_crypted_password()

      - Changes to satisfy Perl::Critic, e.g.
        - Removed function prototypes (they are ignored for methods.)
        - Cleaned up regular expressions: use /x, etc.

(he)