ODS (On-Disk Structure) Changes

Firebird 5.0 creates databases with an ODS (On-Disk Structure) version of 13.1.It can also work with databases created in ODS 13.0 (by Firebird 4.0), but some new features will be unavailable.

See [rnfb50-engine-inline-upgrade] for a new method of upgrading an ODS 13.0 database to 13.1.