larfy: apply Householder reflector symmetrically (2-sided)

Functions
subroutine	clarfy (uplo, n, v, incv, tau, c, ldc, work)
	CLARFY
subroutine	dlarfy (uplo, n, v, incv, tau, c, ldc, work)
	DLARFY
subroutine	slarfy (uplo, n, v, incv, tau, c, ldc, work)
	SLARFY
subroutine	zlarfy (uplo, n, v, incv, tau, c, ldc, work)
	ZLARFY

Detailed Description