Bug 9021: Schema update

Bug 9021: Schema update

This ensures that the DBIx structure matches the SQL structure changes.
See comment #48 as to how this was generated.
Also, I had to modify misc/devel/update_dbix_class_files.pl
to have an "overwrite_modifications => 1" option to get it to generate.
This should correct issues raised in comment #45.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>