ENH: partial overhaul of Matrix type (#1220)

- additional operators:
  + compound assignment
  + inner product: operator&
  + outer product: operator^

- additional functions:
   - MatrixBlock methods: subColumn, subRow, subMatrix
   - L2 norms for matrix or column
   - trace, diag, round, transpose

- MatrixBlock methods: col(), block() are deprecated since their
  access patterns with (size, offset) are unnatural/unwieldy.

- verifications by test/Matrix/Test-Matrix

src/OpenFOAM/matrices/RectangularMatrix/RectangularMatrix.H

@@ -118,7 +118,7 @@ public:
 };
 
 
-// Global functions and operators
+// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
 template<class Type>
 class typeOfInnerProduct<Type, RectangularMatrix<Type>, RectangularMatrix<Type>>
@@ -128,6 +128,7 @@ public:
     typedef RectangularMatrix<Type> type;
 };
 
+
 template<class Type>
 class typeOfInnerProduct<Type, RectangularMatrix<Type>, SquareMatrix<Type>>
 {
@@ -136,6 +137,7 @@ public:
     typedef RectangularMatrix<Type> type;
 };
 
+
 template<class Type>
 class typeOfInnerProduct<Type, SquareMatrix<Type>, RectangularMatrix<Type>>
 {
@@ -145,6 +147,8 @@ public:
 };
 
 
+// * * * * * * * * * * * * * * * Friend Functions  * * * * * * * * * * * * * //
+
 template<class Type>
 RectangularMatrix<Type> outer(const Field<Type>& f1, const Field<Type>& f2);