[MERGE] [IMP] hr: broadcast the welcome message only for new employee coming

from the recruitment, not all created employees.
Before this merge, every created employee was broadcasted to all existing users
of the same company. However when creating a batch of employees, for example
when configuring an new openerp instance, this was creating a lot of noise
in the inboxes.
Now, only recruited employee have a welcome message.

bzr revid: tde@openerp.com-20140218162958-2rr967jh9zu2spwe

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