<PFE-DEBUG>
this word will place an debug-runtime into
the CFA of the following word. If the
word gets executed later, the user will
be prompted and can decide to single-step
the given word. The debug-stepper is
interactive and should be self-explanatory.
(use NO-DEBUG to turn it off again)
reference: p4_debug in ../src/debug.c:0580, export CO DEBUG