SVD computational routines

Modules
	gebrd: reduction to bidiagonal
	gebd2: reduction to bidiagonal, level 2
	labrd: step in gebrd
	gbbrd: band to bidiagonal
	{un,or}gbr: generate Q, P from gebrd
	{un,or}mbr: multiply by Q, P from gebrd
	— auxiliary routines —
	gsvj0: step in gesvj
	gsvj1: step in gesvj
	las2: 2x2 triangular SVD
	lasv2: 2x2 triangular SVD
	lartgs: generate plane rotation for bidiag SVD

Detailed Description