[MaL] Avoid warn about defi. of impl. copy constr.

Clang reports:
warning: definition of implicit copy constructor for 'TemplatePoint<double, 3>'
is deprecated because it has a user-declared destructor [-Wdeprecated]

MathLib/TemplatePoint.h

@@ -46,7 +46,9 @@ public:
 	explicit TemplatePoint(std::array<T,DIM> const& x);
 
 	/** virtual destructor */
-	virtual ~TemplatePoint() {}
+	virtual ~TemplatePoint() = default;
+
+	TemplatePoint(TemplatePoint const& other) = default;
 
 	/** \brief const access operator
 	 *  The access to the point coordinates is like the access to a field. Code example: