Final steps of LibreOffice HSQLDB to FirebirdSQL database migration

Bunth Tamás wrote about the last step on LibreOffice database migration :

It is my third post about implementing HSQL migration inside odb documents in connection with a TDF tender. The previous posts were about creating the schema import, and the import of binary data.

Today I will write about the final steps which has to be made in order to
toggle off experimental feature from Firebird and use HSQLDB migration by default. This process also involves the creation of some unit tests, and
modifying some others.