Make sure that On Create we notify Ccs and other recipients

Otherwise the ticket create form is a partial lie.  I'm not sure how
this wasn't noticed for so long.

This probably also wants an upgrade step, but I'm not sure of the best
way to do that at the moment.
Add a Notify Owner and AdminCcs action

Combining notification of Owner and AdminCcs into the same action
receives the benefit of duplicate recipient squashing if the Owner is
(as commonly is the case) a queue-level AdminCc.
Notify Owner too on Create and Correspond, not just AdminCcs

Otherwise Owners who aren't a queue AdminCc (or also a ticket level
AdminCc) don't receive mail!

This needs a smart upgrade path, similar to 63852e9, which adds the
action if it doesn't exist already and modifies the default scrips if
they still exist.  It also needs a note in UPGRADING-4.2.
Add the new action "Notify Owner and AdminCcs" on upgrade

Rather than try to automatically upgrade scrips, make a note of the
changes and let admins manually update if they'd like.
Fix broken assumptions about scrips in tests

Caused by the new scrip action and new recipients of the default scrips.
Suppress duplicate create notifications in the ___Approvals queue

Approval tests caught the duplicate notifications which occur via the
new owner on create scrip + existing NewPending rule.  Until rules are
replaced by appropriate scrips, squash duplicates by suppressing the
scrip's notification via an empty template.

Unlike Owners which were notified by the rule, AdminCcs always received
notifications via the scrip (before it also included Owner).  They now
receive notifications via the same rule as Owners, as originally
intended judging by the rule's description.  This lets us suppress the
duplicate Owner notifications above while retaining the standard AdminCc
notifications.  It also means Owners and AdminCcs are notified of new
approvals using a single template instead of two unrelated templates.

Tests also needed adjustment for the extra notifications sent to Owners
on correspond, but these are expected.
Merge branch '4.2/fixup-default-scrips'