afswitch and af_max were still used, but since they was declared 'common'
by virtue of their declaration in af.h, the symbols were defined at link-
time, and their contents were considered BSS -- init to zero.
Now, you and i know that jumping to zero causes a core dump...
Therefore: af.c has been resurrected, so the procedure pointers actually
point to procedures, tables.c has had it's change nuked, and af.h
has been changed so afswitch and af_max are declared as 'extern'.
It's obvious that that 'fix' wasn't even tested.
