Activity view improvements:

* issue status changes are now displayed
* display options are kept when using previous/next month links

git-svn-id: http://redmine.rubyforge.org/svn/trunk@646 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/project.rb

@@ -24,6 +24,7 @@ class Project < ActiveRecord::Base
   has_many :users, :through => :members
   has_many :custom_values, :dependent => :delete_all, :as => :customized
   has_many :issues, :dependent => :destroy, :order => "#{Issue.table_name}.created_on DESC", :include => [:status, :tracker]
+  has_many :issue_changes, :through => :issues, :source => :journals
   has_many :versions, :dependent => :destroy, :order => "#{Version.table_name}.effective_date DESC, #{Version.table_name}.name DESC"
   has_many :time_entries, :dependent => :delete_all
   has_many :queries, :dependent => :delete_all