A tested version of the PostgreSQL extension.

A tested version of the PostgreSQL extension.
Now the extension contains two C implemented functions
(naco_normalize and search_normalize). To add the extension to PostgreSQL,
a upgrade sql script is included in the
Open-ILS/src/sql/Pg/upgrage/XXXX.schema.create_extension.sql. This script
drop the plperlu function of naco_nomalize and search_normalize and create
a extension which will add two C version of the two functions.
The extension depend on the ICU4C lib. The environment variable ICU_DATA must
be set up to the right ICU data path before you use the extension.
The extension has been tested in debian and windows environment(50 cases in
/Open-ILS/tests/naco_normalize.t has passed). The source file in this extension
is debian/linux version of the extension while the windows version has some
difference.

Signed-off-by: Swenyu Duan <dsy@sina.com>