Revert previous changes.  We *want* to emphasize that this is about programs.
Change the introduction to be more appealing to pros

I got some feeback from a pro engraver that he considers our
challenges trivial.  This means that we didn't explain well
what this is about.

He also said:
> Incidentally, the best version of Finale for a professional engraver is not the last one
add another stage: transposed versions