Identical to `0=`, used for program clarity to reverse the
result of a previous test.
WARNING: PFE's NOT uses bitwise complement
instead of the logical complement
that loading TOOLBELT will change semantics.
... this difference in semantics has caused dpans94 to
depracate the word. Only if TRUE is -1 it would be identical
but not all words return -1 for true.
forth_83 compiling primitive