Improve UX for `Add New Department`

- Group `Email` and `Template` fields under a single header to signify
  that these settings deal with outgoing mail.
- Rename `Template` to `Template Set`. See Commit 4279ad98.
Add Email->Emails Help Tips
Merge remote branch 'josh/feature/tips-email' into feature/helptips-review

Conflicts:
	include/staff/department.inc.php