gbsv: factor and solve

Functions
subroutine	cgbsv (n, kl, ku, nrhs, ab, ldab, ipiv, b, ldb, info)
	CGBSV computes the solution to system of linear equations A * X = B for GB matrices (simple driver)
subroutine	dgbsv (n, kl, ku, nrhs, ab, ldab, ipiv, b, ldb, info)
	DGBSV computes the solution to system of linear equations A * X = B for GB matrices (simple driver)
subroutine	sgbsv (n, kl, ku, nrhs, ab, ldab, ipiv, b, ldb, info)
	SGBSV computes the solution to system of linear equations A * X = B for GB matrices (simple driver)
subroutine	zgbsv (n, kl, ku, nrhs, ab, ldab, ipiv, b, ldb, info)
	ZGBSV computes the solution to system of linear equations A * X = B for GB matrices (simple driver)

Detailed Description