Added dnd classes, data object classes, changed clipboard class doc,

cured filefn.cpp wxFileNameFromPath bug, some tweaks to HelpGen


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1395 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/filefn.cpp

@@ -648,7 +648,9 @@ wxString wxFileNameFromPath (const wxString& path1)
 	    return wxString(path + 2);
 #endif
     }
-  return wxString("");
+  // Yes, this should return the path, not an empty string, otherwise
+  // we get "thing.txt" -> "".
+  return path1;
 }
 
 // Return just the directory, or NULL if no directory