Job review and approval/rejection emails should go to the user's email

[malemburg]

At the moment, all comments and notification emails are sent to job.email.

In several cases, the job email is a generic one which doesn't necessarily reach the person who filed the job. In other cases, no valid email is given, so the notification emails don't reach anyone.

It would be better to use a two step approach:

1. send the notification emails to the user who posted the job ad
2. if no user information is available, use job.email

It's probably also a good idea to make this user contact email address and the user's name visible to the reviewers (but not the general public).

[berkerpeksag]

Currently, job.email is pre-populated by using user.email at https://www.python.org/jobs/create/:

pythondotorg/jobs/views.py

Line 327 in 2f23ff7

kwargs['initial'] = {'email': self.request.user.email}

I think we can send emails to user.email if user.email != job.email or put user.email in To and job.email in Cc.

@malemburg what do you think?