Added separate permission method for undelete

Defaults to simply call has_publish_permission method, but can be
overridden to have different behaviour if need be.  e.g. state of
objects means publishing should be block, but undelete should be allowed
(or vice versa).

publish/__init__.py

@@ -1,2 +1,2 @@
-VERSION = (0, 3, 5)
+VERSION = (0, 3, 6)
 __version__ = '.'.join(map(str, VERSION))

publish/actions.py

@@ -17,6 +17,7 @@ def _get_change_view_url(app_label, object_name, pk, levels_to_root):
     return '%s%s/%s/%s/' % ('../'*levels_to_root, app_label,
                             object_name, quote(pk)) 
 
+
 def delete_selected(modeladmin, request, queryset):
     # wrap regular django delete_selected to check permissions for each object
     for obj in queryset:
@@ -27,7 +28,7 @@ def delete_selected(modeladmin, request, queryset):
 
 def undelete_selected(modeladmin, request, queryset):
     for obj in queryset:
-        if not modeladmin.has_publish_permission(request, obj):
+        if not modeladmin.has_undelete_permission(request, obj):
             raise PermissionDenied
     for obj in queryset:
         obj.undelete()

publish/admin.py

@@ -110,7 +110,10 @@ def has_delete_permission(self, request, obj=None):
         if obj and obj.is_public:
             return False
         return super(PublishableAdmin, self).has_delete_permission(request, obj)
-
+
+    def has_undelete_permission(self, request, obj=None):
+        return self.has_publish_permission(request, obj=obj)
+
     def has_publish_permission(self, request, obj=None):
         opts = self.opts
         return request.user.has_perm(opts.app_label + '.' + opts.get_publish_permission())