public static BigFloat zero(int fracbits, int expbits) {
		return zero(fracbits, expbits, +1);
	}
Return the BigFloat with the given number of bits representing (positive) zero.

@param fracbits number of fractional bits
@param expbits number of bits in the exponent
@return a BigFloat representing +zero
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcode/floatformat/BigFloat.java