* NOT ( x -- flag )

Identical to `0=`, used for program clarity to reverse the
result of a previous test.

WARNING: PFE's NOT uses bitwise complement INVERT
instead of the logical complement 0=, so
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/DEF toolbelt ordinary primitive