VM and front-end compatibility

Always combine Genero Virtual Machine with a compatible Front-End with an equivalent version number.

Graphical User Interface new features and bug fixes usually require modifications inside the runtime system and front-ends.

The product version number has the form X.YY.ZZ and identifies a given Genero BDL release.

When upgrading the runtime system to a new X.YY version, upgrade to the latest X.YY front-end version as well. For example, after installing an FGL runtime system 4.01.??, upgrade front-ends to the latest available 4.01.?? version.