Purpose of this commit is to improve a bit demo data in mass mailing. This
includes notably
* having real links and UTMs generation for them calling manually
convert_link in demo data;
* having real statistics about clicks by calling add_click in demo data;
It will help having demo data feeling like a real mass mailing has been
sent.
This commit is linked to task ID 1907994 and PR #28533.
- state is now stage_id, many2one towaqrds a newly added stage model, allowing to
tune your process of mailign campaigns. Todo: menu to configure stages + access rights.
- cleaned campaign kanban view, to be smaller.
- added statbuttons in form view of campaigns
bzr revid: tde@openerp.com-20140404153432-b171x0frbfepyfkn