lassq: sum-of-squares, avoiding over/underflow

Functions
subroutine	classq (n, x, incx, scale, sumsq)
	CLASSQ updates a sum of squares represented in scaled form.
subroutine	dlassq (n, x, incx, scale, sumsq)
	DLASSQ updates a sum of squares represented in scaled form.
subroutine	slassq (n, x, incx, scale, sumsq)
	SLASSQ updates a sum of squares represented in scaled form.
subroutine	zlassq (n, x, incx, scale, sumsq)
	ZLASSQ updates a sum of squares represented in scaled form.

Detailed Description