Force ssl_verify_server on and disable SSLv2 support

Origin: http://www.openwall.com/lists/oss-security/2010/06/14/4
Disable SSLv3 by default [CVE-2014-3566]

cf. https://blog.mozilla.org/security/2014/10/14/the-poodle-attack-and-the-end-of-ssl-3-0/
Merge branch 'bug/ssl-init'
Update config.sub with autotools-dev 20140911.1
Merge branch 'bug/autotools-config'
Update README.SSL to follow default values
Merge branch 'bug/ssl-init'
Update to 0.5.3+debian-18
Merge branch 'feature/debian-version'
Update ChangeLog
Merge branch 'bug/changelog'