- add a email_recipients field, that is a field holding a comma separated list of partner_ids; this allows to add partners in the compose wizard that are directly visible in the 'additional contacts' field
- updated EDI templates to use email_recipients instead of email_to
- email_to is kept and is still working; email_to matching partners and email_recipients are concatenated
- slighty improved mail.compose.message form view when email_template is installed
added a test for this upgraded feature
bzr revid: tde@openerp.com-20121113150903-igm0fppm4r8ezcbe