Bug 16273: Add the ability not to display the login details for newly registered...

Bug 16273: Add the ability not to display the login details for newly registered patrons

When a new patron registers, the confirmation page is displayed with
login details (login, password, cardnumber) and the login form is
prefilled.
In the case of public computer, for security reasons that should not
appear, patrons might forget to close the window.

Test plan:
1/ Set PatronSelfRegistrationPrefillForm on
2/ Register a new patron
=> The login details should not be displayed and the login form should
not be prefilled.

Sponsored-by: BULAC - http://www.bulac.fr/
Signed-off-by: Nicolas Legrand <nicolas.legrand@bulac.fr>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>