More flexible mail notifications settings at user level. A user has now 3 options:

* notification on any event on all his projects
* notification on any event on selected projects only (if the user belongs to more than 1 project)
* notification only for things that he watches or he is involded in (eg. issues that he watches or he is author or assignee)

git-svn-id: http://redmine.rubyforge.org/svn/trunk@855 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -143,6 +143,15 @@ class Issue < ActiveRecord::Base
     project.assignable_users
   end
   
+  # Returns the mail adresses of users that should be notified for the issue
+  def recipients
+    recipients = project.recipients
+    # Author and assignee are always notified
+    recipients << author.mail if author
+    recipients << assigned_to.mail if assigned_to
+    recipients.compact.uniq
+  end
+  
   def spent_hours
     @spent_hours ||= time_entries.sum(:hours) || 0
   end