[MOD]As of discussed in the last webinar Set 19th, new defaults set syntax highlighter on, while  its theme is kept as 'off but switchable'. Thanks jonnyb for coding this option some time ago.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@47592 b456876b-0849-0410-b77d-98878d47e9d5