This is a very simple patch, in order to allow define a level of confidenciality to certain pages in the Wiki.
The pages that contain the string Private (for example HomePrivate) will need the need privilege WIKI_PRIVATE (or WIKI_ADMIN) in order to be shown, edited or deleted.
The new privilege is very easy to administrate if you use WebAdmin
If you have any issues, create a new ticket.
Download the zipped source from here.
Add Private to the name of your private pages, and add the WIKI_PRIVATE privilege to those users you want to allow access.