Add view_issues permission (#3187).

A migration adds this permission to all existing roles to preserve current behaviour.
This permission controls access to issues, roadmap and changelog.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3039 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/20091114105931_add_view_issues_permission.rb

@@ -0,0 +1,13 @@
+class AddViewIssuesPermission < ActiveRecord::Migration
+  def self.up
+    Role.find(:all).each do |r|
+      r.add_permission!(:view_issues)
+    end
+  end
+
+  def self.down
+    Role.find(:all).each do |r|
+      r.remove_permission!(:view_issues)
+    end
+  end
+end