Initial working version.

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+Simple PAM module to check the username's existance (or lack of) in a file.
+
+To use simply call from a PAM file passing the file to check (file=) and the
+mode (mode=).  If mode is block then a user is authenticated if they don't
+exist in the file.  Any other mode means the user is authenticated if they do
+appear in the file, e.g.
+
+auth       required    pam_file.so         file=/etc/email.allow mode=allow