Add explicit always_notify and always_notify_bcc options to ticket system.

[jsiirola@…]

Many Trac instances make use of the smtp_always_bcc option to send all ticket notifications to a mailing list. This is problematic as many plugins (e.g. the ​AccountManager or ​TicketModerator) directly leverage the notification system to send non-public administrative email. The current workaround is for each plugin to either completely reimplement the notify() method or to hack the site configuration:

old_smtp_always_bcc = self.config.get('notification', 'smtp_always_bcc')
# override the smtp_always_bcc option so that no emails are sent out to that address
self.config.set('notification', 'smtp_always_bcc', '')
try:
    NotifyEmail.notify(self, None, subject)
finally:
    self.config.set('notification', 'smtp_always_bcc', old_smtp_always_bcc)

A better solution would be to add always_notify and always_notify_bcc options to the ticket system. These options would specify users/addresses to add to the CC / BCC recipient lists for all ticket emails. The former would be trivial to add (it would just return additional cc: addresses as part of the get_recipients() method). Adding bcc: addresses would probably require modifying the get_recipients() method to return a 3-element tuple (to, cc, bcc).

[cboos]

PatchWelcome.