While twiddling my thumbs waiting for vacation to start, I "fixed" the
Gold control_b function I just added to work in the current_direction.
If the current direction (as selected with KP5) is reverse, then you'll
need to have the cursor placed over one of '"]})>' before typing gold
control B. The messages should be clear if you don't do it right.

This balancing act is to be credited to Ed Rotberg. It was his idea; I just
coded it up in TPU. 

ds