[Oberon] B2 Framework

[Andreas Pirklbauer]

   > But you promised to keep it frozen while you keep working on your mainline compiler…
   > which has many safety enhancements. It will feel safer to follow your mainline.

Yes I did promise that, but I recently couldn’t resist and decided to add some new
features indeed, for example to allow importing modules in any order.

However, all compilers of the repository - including said retro-compiler -
are *always* automatically kept in sync with the mainline compiler ;-)