Adds 2 permissions (closes #859):

* edit_time_entries: lets a user edit/delete any time entry
* edit_own_time_entries: lets a user edit/delete its own time entries only

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1249 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/time_entry.rb

@@ -50,7 +50,7 @@ class TimeEntry < ActiveRecord::Base
   
   # Returns true if the time entry can be edited by usr, otherwise false
   def editable_by?(usr)
-    usr == self.user
+    (usr == user && usr.allowed_to?(:edit_own_time_entries, project)) || usr.allowed_to?(:edit_time_entries, project)
   end
   
   def self.visible_by(usr)