[ENH] [bp 50130] add new plugin y/n parameter page_edit_icon which allows/disallows the edit icon to edit the included page to be shown - defaults to 'y'

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50131 b456876b-0849-0410-b77d-98878d47e9d5