Add an information blurb option to PromptWindow.

- PromptWindow now takes a parameter which contains optional
  informational text to display above the text control.

- Adjust callers.

headers/private/shared/PromptWindow.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012, Rene Gollent, [email protected].
+ * Copyright 2012-2013, Rene Gollent, [email protected].
  * Distributed under the terms of the MIT License.
  */
 #ifndef PROMPT_WINDOW_H_
@@ -10,6 +10,7 @@
 #include <Window.h>
 
 
+class BStringView;
 class BTextControl;
 
 
@@ -17,8 +18,9 @@ class PromptWindow : public BWindow
 {
 public:
 								// PromptWindow takes ownership of message
-								PromptWindow(const char* title, const char* label, BMessenger target,
-									BMessage* message = NULL);
+								PromptWindow(const char* title,
+									const char* label, const char* info,
+									BMessenger target, BMessage* message = NULL);
 								~PromptWindow();
 
 	virtual void				MessageReceived(BMessage* message);
@@ -27,6 +29,7 @@ public:
 		status_t				SetMessage(BMessage* message);
 private:
 		BTextControl*			fTextControl;
+		BStringView*			fInfoView;
 		BMessenger				fTarget;
 		BMessage*				fMessage;
 };