Merge the two "load from file" constructors in cDialog (using defaulted parameter)

osx/dialogxml/dialog.cpp

@@ -726,10 +726,6 @@ template<> pair<string,cTextField*> cDialog::parse(Element& who /*field*/){
 
 cDialog::cDialog(cDialog* p) : parent(p) {}
 
-cDialog::cDialog(std::string path) : parent(NULL) {
-	loadFromFile(path);
-}
-
 cDialog::cDialog(std::string path, cDialog* p) : parent(p) {
 	loadFromFile(path);
 }

osx/dialogxml/dialog.h

@@ -48,8 +48,7 @@ public:
 	static const short BG_LIGHT, BG_DARK;
 	static short defaultBackground;
 	explicit cDialog(cDialog* p = NULL); // dialog with no items
-	explicit cDialog(std::string path); // cd_create_dialog
-	cDialog(std::string path,cDialog* p); // cd_create_dialog_parent_num
+	explicit cDialog(std::string path, cDialog* p = NULL); // cd_create_dialog
 	~cDialog(); // cd_kill_dialog
 	bool add(cControl* what, RECT ctrl_frame, std::string key); // returns false if the key is used, true if the control was added
 	bool remove(std::string key); // returns true if the key existed and was removed, false if the key did not exist