Update TODO file with some ideas for improvements in hard link handling

These ideas may not be very easy to implement, and may not be worth
the performance penalty they might introduce. But that's something that
still needs to be investigated.

TODO

@@ -17,5 +17,10 @@ Small list of planned features/changes, suggestions are always welcome.
   * Use one key to open up a menu with sort options, instead of
     having a special key for each column
 
-- Fix bugs:
-  * Handle hard links
+- Better handling of hard links?
+  * Link the files together in the browser interface
+  * Have a separate size variable for "shared" data
+    (displayed in the browser as e.g. "291+3MiB")
+    This should be both more intuitive and more correct than simply
+    counting a semi-random occurence and ignoring others, as we do now.
+