Adds permissions to let users edit and/or delete their messages (#854, patch by Markus Knittig with slight changes).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2019 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/fixtures/roles.yml

@@ -80,6 +80,8 @@ roles_002:
     - :protect_wiki_pages
     - :delete_wiki_pages
     - :add_messages
+    - :edit_own_messages
+    - :delete_own_messages
     - :manage_boards
     - :view_files
     - :manage_files