[IMP] [CLEAN] [REF] mail, res_partner, res_users, hr: cleaned partner /...

[IMP] [CLEAN] [REF] mail, res_partner, res_users, hr: cleaned partner / employee profile following last specifications.
Partner profile is now classic, no more email-routing.
Writing on res.users, basically, begins a private discussion.
With HR, emails on res.users are private discussions, other
are post on employee profile.
Some cleaning in Chatter about Followers of ... , now talking about
partner or employee profile.

bzr revid: tde@openerp.com-20130515153159-cm52byvb7w6m1sxs