[FIX] web: chardomain widget: fixed selection of some records in a list (bad domain formatting), fixed domain evaluation tah is done server-side instead of through a stringigy.

[IMP] website_mail: improved snippet to subscribe to a mail.group

Main modifications :
- layout: input - button when not following, links (email - archives - unsubscribe) when following
- when adding your email, update all other subscribe snippets input in the page to avoid havign to re-type it
- management of fields of the record to subscribe to, used to have access to the alias of the group

This commit is related to 8d496399 and b88755c4
When hitting buttons of type object, the active_model and active_id(s) were kept, and, therefore, when calling a feature using the active* args, this feature used the active* args from the previous action.
Nevertheless, concerning wizards, the active* args should be indeed the active* args of the previous action, as wizards expects to have the active* args from the previous action. Thus, we reset these active* args only when this is not a wizard (target === 'current')
For example, from a sales order, hit the 'view invoice' button, and on the invoice, hit the 'send by email' button: The active_id in the send by email wizard were the id of the sale order, not of the invoice

[FIX] access rights for public user on res.partner.grade

This access rights checks is meaningful for website_blog only

[FIX] website: DOM fixes according to W3C Validator

[FIX] Multiple report fixes including better handling of rendering a report with one worker (and the removal of the workers creation) and some report views changes (address block more to the left)

Improve handling of website image fields

I have no idea why I originall implemented that crap via string munging.

[MERGE] website_mail_group: cleaning and usability improvement of this web module
- refactored the website templates that were basically impossible to use
- fixed display by thread / date and navigation
- added information about group email, participants, messages, ...

[IMP] website_mail_group: display previous / next message when browsing + take into account thread or date mode.

Some fixes in the image qweb widget + CMS fixes

[FIX] website_mail_group: effectively handle replies_per_page parameter that controls the number of replies to display under each message.

[FIX] website_mail_group: better layout for main mailing lists page: more space for subscribe button

[MERGE][FIX] website_event_track: display speakers name to public users