Made Matrix generic base-class for SquareMatrix and RectangularMatrix by introducing

the type it will become as a template argument.

Brought everything into line with this change.

src/ODE/ODESolvers/SIBS/polyExtrapolate.C

@@ -36,7 +36,7 @@ void Foam::SIBS::polyExtrapolate
     scalarField& yz,
     scalarField& dy,
     scalarField& x,
-    Matrix<scalar>& d
+    scalarSquareMatrix& d
 ) const
 {
     label n = yz.size();