Short-float operators

### Short-float operators

These `short-float` declared-numeric operators are defined in the `:gbbopen-tools` module:

 Operator Operation Example `\$&` `the short-float` `(\$& x)` `+\$&` `+` `(+\$& x y z)` `-\$&` `-` `(-\$& x y z)` `1+\$&` `1+` `(1+\$& x)` `1-\$&` `1-` `(1-\$& x)` `*\$&` `*` `(*\$& x y z)` `/\$&` `/` `(/\$& x y z)` `=\$&` `=` `(=\$& x y z)` `/=\$&` `/=` `(/=\$& x y z)` `<\$&` `<` `(<\$& x y z)` `<=\$&` `<=` `(<=\$& x y z)` `>\$&` `>` `(>\$& x y z)` `>=\$&` `>=` `(>=\$& x y z)` `abs\$&` `abs` `(abs\$& x)` `bounded-value\$&` `bounded-value` `(bounded-value\$& x y z)` `ceiling\$&` `ceiling` `(ceiling\$& x divisor)` `decf\$&` `decf` `(decf\$& x delta)` `decf-\$&after` `decf-after` `(decf\$&-after x delta)` `decf/delete\$&-acons` `decf/delete-acons` `(decf/delete\$&-acons` `x delta alist)` `evenp\$&` `evenp` `(evenp\$& x)` `fceiling\$&` `fceiling` `(fceiling\$& x divisor)` `floor\$&` `floor` `(floor\$& x divisor)` `ffloor\$&` `ffloor` `(ffloor\$& x divisor)` `fround\$&` `fround` `(fround\$& x divisor)` `ftruncate\$&` `ftruncate` `(ftruncate\$& x divisor)` `incf\$&` `incf` `(incf\$& x delta)` `incf\$&-after` `incf-after` `(incf\$&-after x delta)` `max\$&` `max` `(max\$& x y z)` `min\$&` `min` `(min\$& x y z)` `minusp\$&` `minusp` `(minusp\$& x)` `mod\$&` `mod` `(mod\$& x divisor)` `oddp\$&` `oddp` `(oddp\$& x)` `plusp\$&` `plusp` `(plusp\$& x)` `pushnew/incf\$&-acons` `pushnew/incf-acons` `(pushnew/incf\$&-acons` `'x delta alist)` `round\$&` `round` `(round\$& x divisor)` `truncate\$&` `truncate` `(truncate\$& x divisor)` `zerop\$&` `zerop` `(zerop\$& x)`

The one-argument function coerce\$& provides convenient `short-float` coercion:

```  (setf x (coerce\$& x))
```

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 Short-float operators