Add square dense matrix constructor reusing existing one.

This simplifies matrix construction in many places because in many cases we need just a bilinear form.

MathLib/LinAlg/Dense/DenseMatrix.h

@@ -35,6 +35,10 @@ public:
 	typedef IDX_TYPE IDX_T;
 
 public:
+   /// Dense square matrix constructor.
+   DenseMatrix (IDX_TYPE rows) : DenseMatrix(rows, rows) {};
+
+   /// Dense rectangular matrix constructor.
    DenseMatrix (IDX_TYPE rows, IDX_TYPE cols);
    DenseMatrix (IDX_TYPE rows, IDX_TYPE cols, const FP_TYPE& val);
    DenseMatrix (const DenseMatrix &src);

MathLib/LinAlg/Dense/GlobalDenseMatrix.h

@@ -30,6 +30,12 @@ public:
 	typedef FP_TYPE FP_T;
 
 public:
+	/// Dense square matrix constructor.
+	GlobalDenseMatrix (IDX_TYPE rows)
+		: GlobalDenseMatrix(rows, rows)
+	{ };
+
+	/// Dense rectangular matrix constructor.
 	GlobalDenseMatrix (IDX_TYPE rows, IDX_TYPE cols);
 	GlobalDenseMatrix (IDX_TYPE rows, IDX_TYPE cols, const FP_TYPE& val);
 	GlobalDenseMatrix (const GlobalDenseMatrix &src);