ENH: improvements, modernization of matrix containers (#1220)

- add iterators, begin/end, empty() methods for STL behaviour.
  Use standard algorithms where possible
     * std::fill, std::copy
     * std::min_element, std::max_element

- access methods consistent with other OpenFOAM containers:
     * data(), cdata(), uniform()

- Use ListPolicy to impose output line breaks

- Can recover matrix storage for re-use elsewhere.
  For example, to populate values with 2D i-j addressing and later
  release it as flat linear storage.

- construct/assign moveable

- added minMax() function for Matrix

- additional inplace +=, -=, *=, /= operations

- add named methods at() and rowData() to Matrix.
  Allows a better distinction between linear and row-based addressing

- low-level matrix solve on List/UList instead of Field

src/OpenFOAM/matrices/RectangularMatrix/RectangularMatrixI.H

@@ -84,20 +84,20 @@ inline Foam::RectangularMatrix<Type>::RectangularMatrix
 (
     const label m,
     const label n,
-    const Type& t
+    const Type& val
 )
 :
-    Matrix<RectangularMatrix<Type>, Type>(m, n, t)
+    Matrix<RectangularMatrix<Type>, Type>(m, n, val)
 {}
 
 
 template<class Type>
 inline Foam::RectangularMatrix<Type>::RectangularMatrix
 (
-    const SquareMatrix<Type>& SM
+    const SquareMatrix<Type>& mat
 )
 :
-    Matrix<RectangularMatrix<Type>, Type>(SM)
+    Matrix<RectangularMatrix<Type>, Type>(mat)
 {}
 
 
@@ -125,6 +125,13 @@ void Foam::RectangularMatrix<Type>::operator=(const zero)
 }
 
 
+template<class Type>
+void Foam::RectangularMatrix<Type>::operator=(const Type& val)
+{
+    Matrix<RectangularMatrix<Type>, Type>::operator=(val);
+}
+
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 namespace Foam