[FIX] website: with firefox the responsive images inside a table are not resize; When entering values in the table , the table size extended evenif the text limit is not reached..will never go to the next line

[FIX] summernote lib: When we edit a text in a existing link (with the modal) a link is created into the previous link

[FIX] website editor: Enter in ordered list is not properly working every new record takes the value 1 rather then incrementing it

[FIX] website editor: When the text is having some effect like Bold, Italic or Underline , or even the color is there , then user wants to give the Style (Header1 , Header2 etc) , the previous effect goes off..it should retain

[FIX] ir_http : move the handeling of virtual path to ir_attachment from website to base. This will allow css generated from less to be called in the backend.

[IMP] im_odoo_support : remove dependencies to im_chat. im_chat and bus are not auto install anymore.

[IMP] website_customer: add tags on partners. That allows to sort/filter the customers on website. Old categories [res.partner.category] (named Tags in UI) was confusing with tags and have been renamed into Categories.

1. The merge of the "email_template" module into the "mail" module.
2. The send action of the mass mailing has been moved from the frontend to a cron, because it was too slow to send over 10,000 mails (the user's browser was blocked for 15 - 20 minutes). Mass mailings have now their own process in the kanban view.
3. Mails sent from the mail form are sent immediatly instead of from the mail queue (for instance, when you go to sales > customers > list view > select 2 -3 customers > More > Partner Mass Mailing).
4. Users have now the choice from which mailing list they want to unsubscribe when they click on the unsubscribe link at the bottom of the mail.
5. Mass mailings inherit from their campaign UTMs and mass mailing campaigns are linked to an UTM campaign.
6. Many little improvements

e.g. to avoid creating "openerp-gevent" in /usr/bin/

  - Add a new SystrayMenu widget to improve and facilitate the way
    of adding widgets in .oe_systray
  - Rendering of the modules menu now waits for the systray and
    user menus to be rendered
  - A few refactoring of the UserMenu and Menu widgets

[FIX] ir_attachment : move the computation of mimetype. Allow to set it during a create. If not given, it will be computed as a functionnal field depending on datas or datas_fname. Bundle generated from less file are not octet-stream mimetype, but text/css given by the bundle itself. The checksum is now computed also for empty datas (and only for binary type attachment).

Before, all crm.lead of the partner were counted, whatever it was a lead or an opportunity, but the button opens the opportunity tree, which has a domain type = opportunity. So leads were not displayed, and the count was therefore misleading.

Besides, the button is called "Opportunities", and it was misleading to count leads for a button with such a name

wkhtml support float values for margins so there is no reason to restrict
the value to integer.
This also avoids bugs like #3367.

Setting the margins of a paperformat to 0mm was ignored and fallbacked on wkhtml
default margins.
This change is considered as relatively safe as margin-* fields have a default
value and setting 0 is then an explicit choice.
Fixes #3367, opw 620130