potrs: triangular solve using factor

Functions
subroutine	cpotrs (uplo, n, nrhs, a, lda, b, ldb, info)
	CPOTRS
subroutine	dpotrs (uplo, n, nrhs, a, lda, b, ldb, info)
	DPOTRS
subroutine	spotrs (uplo, n, nrhs, a, lda, b, ldb, info)
	SPOTRS
subroutine	zpotrs (uplo, n, nrhs, a, lda, b, ldb, info)
	ZPOTRS

Detailed Description