lanv2: 2x2 Schur factor

Functions
subroutine	dlanv2 (a, b, c, d, rt1r, rt1i, rt2r, rt2i, cs, sn)
	DLANV2 computes the Schur factorization of a real 2-by-2 nonsymmetric matrix in standard form.
subroutine	slanv2 (a, b, c, d, rt1r, rt1i, rt2r, rt2i, cs, sn)
	SLANV2 computes the Schur factorization of a real 2-by-2 nonsymmetric matrix in standard form.

Detailed Description