Function: bitnegimply
Section: conversions
C-Name: gbitnegimply
Prototype: GG
Help: bitnegimply(x,y): bitwise "negated imply" of two integers x and y,
 in other words, x BITAND BITNEG(y). Negative numbers behave as if modulo big
 power of 2
Description: 
 (small, small):small:parens	$(1)&~$(2)
 (gen, gen):int	gbitnegimply($1, $2)

