Text to go in the release notes:
This enhancement allows libraries to receive notifications when patrons self-register.
This is enabled using the new system preference EmailPatronRegistrations (options are: none, email address of library, EmailAddressForPatronRegistrations, and KohaAdminEmailAddress) and a new notice (OPAC_REG).
To use a specific email address for notifications, use the new system preference EmailAddressForPatronRegistrations.
If verification is required for self-registrations (when PatronSelfRegistrationVerifyByEmail is enabled), then notifications are only sent to the library once the registration is confirmed.