Add getPresentationValue function prototype

src/Mod/Sketcher/App/Constraint.h

@@ -95,6 +95,9 @@ public:
     virtual void Restore(Base::XMLReader &/*reader*/);
 
     virtual PyObject *getPyObject(void);
+    
+    // Return presentation string. Will include units if HideUnits option is NOT selected. May still return units if rendered units are not the base units (i.e. a small dimension returned in mm instead of m). Only length untis may be hidden.
+    QString getPresentationString() const;
 
     Base::Quantity getPresentationValue() const;
     inline void setValue(double newValue) {