[publisher] add a DEFAULT_CHARSET variable which can be overriden from the Defaults module

This commit also work-around bugs consequent to the change of default
charset in quixote 2.7.

authentic/publisher.py

@@ -1,6 +1,10 @@
 from cStringIO import StringIO
 import traceback
 
+import quixote
+
+DEFAULT_CHARSET = 'iso-8859-1'
+
 from Defaults import *
 
 try:
@@ -16,6 +20,8 @@ import sessions
 
 import identities
 
+quixote.DEFAULT_CHARSET = DEFAULT_CHARSET
+
 class AuthenticPublisher(QommonPublisher):
     APP_NAME = 'authentic'
     APP_DIR = APP_DIR
@@ -24,6 +30,8 @@ class AuthenticPublisher(QommonPublisher):
     WEBROOT_DIR = None
 
     supported_languages = ['fr']
+    # to modify charset of an v
+    site_charset = DEFAULT_CHARSET
 
     root_directory_class = RootDirectory
     admin_directory_class = AdminRootDirectory