WinHelp to HtmlHelp conversion, part 2

This updates the various dialogs to use the new functions.  The help
system should be fully functional now.

app/ImageFormatDialog.cpp

@@ -5,7 +5,6 @@
  */
 #include "stdafx.h"
 #include "ImageFormatDialog.h"
-#include "HelpTopics.h"
 #include "../diskimg/DiskImg.h"
 
 
@@ -303,14 +302,3 @@ void ImageFormatDialog::OnOK(void)
 
     CDialog::OnOK();
 }
-
-BOOL ImageFormatDialog::OnHelpInfo(HELPINFO* lpHelpInfo)
-{
-    WinHelp(lpHelpInfo->iCtrlId, HELP_CONTEXTPOPUP);
-    return TRUE;    // indicate success??
-}
-
-void ImageFormatDialog::OnHelp(void)
-{
-    WinHelp(HELP_TOPIC_DISK_IMAGES, HELP_CONTEXT);
-}