[FIX]Usability: most novice tiki admins won't deduce how to see the other preferences without an explicit tip about the Preference Filters (in 13.x they are hidden by default, whereas in 12.x they where exposed). Feel free to improve.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52151 b456876b-0849-0410-b77d-98878d47e9d5