Bug 25511: Add --force option to update_dbix_class_files.pl

Bug 25511: Add --force option to update_dbix_class_files.pl

This adds a --force option to the aforementioned script allowing those
in the know to overwrite the schema when changes above the found are
detected.

Signed-off-by: Ere Maijala <ere.maijala@helsinki.fi>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 34666e26902facdc3bc7e46a7ecd539f69f813e5)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>