Wiki page protection (#851, patch #1146 by Mateo Murphy with slight changes).

New permission added: protect wiki pages. Once a page is protected, it can be edited/renamed/deleted only by users who have this permission.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1415 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/fixtures/roles.yml

@@ -29,6 +29,7 @@ roles_001:
     - :manage_documents
     - :view_wiki_pages
     - :edit_wiki_pages
+    - :protect_wiki_pages
     - :delete_wiki_pages
     - :rename_wiki_pages
     - :add_messages
@@ -69,6 +70,7 @@ roles_002:
     - :manage_documents
     - :view_wiki_pages
     - :edit_wiki_pages
+    - :protect_wiki_pages
     - :delete_wiki_pages
     - :add_messages
     - :manage_boards