Update to 0.9.18. Changes:
- Add support for newer GnuTLS 2.2.0 session priority functions. When
the option is available, the user might specify TLS settings through
the "tls-options" configuration entry.
- Workaround a GnuTLS issue where the client wouldn't be able
to negotiate a supported compression protocol with the server (#299).
- Implement variable substitution in Prelude configuration files.
- Allow IDMEF criteria with multiples values for a single path,
as can be seen in the following example:
alert.classification.text = (A || B || C || D)
- Implement negation of idmef-criteria, allowing to write criteria like:
! (alert.classification.text = A || alert.classification.text = B)
- Fix an IDMEF-Criteria matching problem, where the match function would
not attempt to match a OR after multiple consecutive AND that failed.
Thanks Alexander Afonyashin <firm(at)iname.com> for pointing out the
problem.
- Never use non-pointer field, always use the "required" keyword. Fix
API consistency issue, that could lead to unexpected behavior.
- Fix multiples problem with prelude_read_multiline /
prelude_read_multiline2,
(fix a problem with prelude-manager idmef-criteria that wouldn't read
external ruleset).
- Error out if GnuTLS initialization fail.

(shannonjr)