Extend Manager protection to Sessions Explorer, and add an override...

Extend Manager protection to Sessions Explorer, and add an override possibility for Sessions Explorer only (#LEMONLDAP-264)

git-svn-id: svn://svn.forge.objectweb.org/svnroot/lemonldap/branches/lemonldap-ng_version_1_0-bugfixes@1943 1dbb9719-a921-0410-b57f-c3a383c2c641