[ADD] mass_mailing: add a snippet to allow subscribing to a contact list (newsletter)
[IMP] website_mail, mass_mailing: icon in editor for the snippets + renaming
[MERGE] Sync with upstream (saas-4)
[FIX] account_analytic_analysis: revert method signature change made at rev 9277

The additional parameters were made to avoid overwriting values when changing of template.
As we can not add parameters in only one module, we overwrite values only for not saved records.
This mitigates the overwrite while not changing the API.
[FIX] Event - Allow to specify the timezone from the event and use it in template mail.
[FIX] Event - Don't update the context but a copy when we recompute dates with the timezone specified for the event.
[MERGE] Sync with upstream (saas-4)
[IMP] website_mail: rename newsletter mail group to discussion group
to avoid confusion with mass mailing mailing lists and newsletters.
[IMP] mass_mailing: added newsletter as mailing list data + imported contact still demo data
[IMP] subscribe to group / newsletter widgets: wording cleaning
[FIX] website_forum: correct the 'Editor' goal definition, the field author_id on a mail_message is a m2o to res.partner and not res.users
[MERGE] [ADD] mass_mailing: add a snippet to allow subscribing to a contact list (newsletter). Also cleaned the wording of the snippet allowing to subscribe do a discussion group to avoid confusion.
[MOV] ir.ui.view#write() forced noupdate moved in `website` (RTE only)
[MERGE] upsteam
[IMP] dumb code
[MOV] ir.ui.view#write() forced noupdate moved in `website` (RTE only)
Forward-port of latest saas-4, up to revision 9416 (rev-id fme@openerp.com-20140509164338-gnz7p3qxt8etrh5w)
[IMP] mail docs

* fill-paragraph
* remove sections referring to removed methods with no obvious replacement
[IMP] gamification: improve the name of some m2m relations
[IMP] mail, base_import: context key disabling history tracking

* added a ``tracking_disable`` context key used by mail to completely disable
  subscriptions setup and events generation during create and write operations
* added import option to optionally set up that context key and speed up
  imports at the cost of not setting up subscriptions and not sending
  create/update events