Make the "state" field in registration a togglable YAOUS

Some countries do not use "State" therefore we need to create
a YAOUS to make it non-required/displaying.  This also requires
that we no longer force a "not null" on state in actor.usr_address.

Signed-off-by: Michael Peters <mrpeters@library.in.gov>
Signed-off-by: Pasi Kallinen <pasi.kallinen@pttk.fi>
Signed-off-by: Ben Shum <bshum@biblio.org>
LP1079041 - making state not required (continued)

The last commit did not add the default YAOUS to the seed data. Also, some
wording tweaks to bring the content in line with the existing entries for
consistency.

Signed-off-by: Ben Shum <bshum@biblio.org>
Stamping upgrade script for making state not required

Signed-off-by: Ben Shum <bshum@biblio.org>