Improved mass mailing form view, that is used as a central point to create new
mailings.
Added concept of contact list (based on partner, or leads (to add)), as well as
contact (a list of name / email to import). Mailings are done un contact list
to simplify the way it works.
Added a kanban view of templates, with a flag to filter only mass mailing templates
(to avoid havign to deal with acknoledgments).
Using campaigns is now an option (a group), mailings can be done without having to
deal with campaigns.
Mailings and campaigns now have a status, used to display their kanban view.
bzr revid: tde@openerp.com-20140314165113-g4gvvifrhr2nfu15
Thibault Delavallée