[NEW] UI to use wikiLingo if it is enabled, with the option to use old parser when creating new wiki page

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/experimental@49825 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Bring wysiwyg preview online

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/experimental@49840 b456876b-0849-0410-b77d-98878d47e9d5