Working implementation of blocked QR

Improved function documentation

Fixed dlarfb and dlarft and added full tests

Added dgelq2

Working Dgels

Fix many comments and tests

Many PR comment responses

Responded to more PR comments

Many PR comments

lapack.go

@@ -10,23 +10,51 @@ const None = 'N'
 
 type Job byte
 
-const (
-	All       (Job) = 'A'
-	Slim      (Job) = 'S'
-	Overwrite (Job) = 'O'
-)
-
+// CompSV determines if the singular values are to be computed in compact form.
 type CompSV byte
 
 const (
-	Compact  (CompSV) = 'P'
-	Explicit (CompSV) = 'I'
+	Compact  CompSV = 'P'
+	Explicit CompSV = 'I'
 )
 
-// Float64 defines the float64 interface for the Lapack function. This interface
-// contains the functions needed in the gonum suite.
+// Complex128 defines the public complex128 LAPACK API supported by gonum/lapack.
+type Complex128 interface{}
+
+// Float64 defines the public float64 LAPACK API supported by gonum/lapack.
 type Float64 interface {
 	Dpotrf(ul blas.Uplo, n int, a []float64, lda int) (ok bool)
 }
 
-type Complex128 interface{}
+// Direct specifies the direction of the multiplication for the Householder matrix.
+type Direct byte
+
+const (
+	Forward  Direct = 'F' // Reflectors are right-multiplied, H_1 * H_2 * ... * H_k
+	Backward Direct = 'B' // Reflectors are left-multiplied, H_k * ... * H_2 * H_1
+)
+
+// StoreV indicates the storage direction of elementary reflectors.
+type StoreV byte
+
+const (
+	ColumnWise StoreV = 'C' // Reflector stored in a column of the matrix.
+	RowWise    StoreV = 'R' // Reflector stored in a row of the matrix.
+)
+
+// MatrixNorm represents the kind of matrix norm to compute.
+type MatrixNorm byte
+
+const (
+	MaxAbs       MatrixNorm = 'M' // max(abs(A(i,j)))  ('M')
+	MaxColumnSum MatrixNorm = 'O' // Maximum column sum (one norm) ('1', 'O')
+	MaxRowSum    MatrixNorm = 'I' // Maximum row sum (infinity norm) ('I', 'i')
+	NormFrob     MatrixNorm = 'F' // Frobenium norm (sqrt of sum of squares) ('F', 'f', E, 'e')
+)
+
+// MatrixType represents the kind of matrix represented in the data.
+type MatrixType byte
+
+const (
+	General MatrixType = 'G' // A dense matrix (like blas64.General).
+)