private void makeOne() {
		kind = FloatKind.FINITE;
		scale = 0;
		unscaled = BigInteger.ONE.shiftLeft(fracbits - 1);
	}
{@code this=sqrt(this)}

	<p>Square root by abacus algorithm, Martin Guy @ UKC, June 1985.
	From a book on programming abaci by Mr C. Woo.
	Argument is a positive integer, as is result.

 <p>adapted from http://medialab.freaknet.org/martin/src/sqrt/sqrt.c
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcode/floatformat/BigFloat.java