Per project forums added.

Permissions for forums management can be set in "Admin -> Roles & Permissions".
Forums can be created on the project settings screen ("Forums" tab).
Once a project has a forum, a "Forums" link appears in the project menu.
For now, posting messages in forums requires to be logged in. Files can be attached to messages.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@529 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/fixtures/boards.yml

@@ -0,0 +1,19 @@
+--- 
+boards_001: 
+  name: Help
+  project_id: 1
+  topics_count: 1
+  id: 1
+  description: Help board
+  position: 1
+  last_message_id: 2
+  messages_count: 2
+boards_002: 
+  name: Discussion
+  project_id: 1
+  topics_count: 0
+  id: 2
+  description: Discussion board
+  position: 2
+  last_message_id: 
+  messages_count: 0