Enhancement

- Re-enabled the onProjectChange function, and upgraded it to TDB2.
  Now it does a lot less, which is another way of saying it is faster.

src/commands/CmdAdd.cpp

@@ -60,7 +60,7 @@ int CmdAdd::execute (std::string& output)
   if (context.verbose ("new-id"))
     output = format (STRING_CMD_ADD_FEEDBACK, context.tdb2.next_id ()) + "\n";
 
-// TODO context.footnote (onProjectChange (task));
+  context.footnote (onProjectChange (task));
 
   context.tdb2.commit ();
   return rc;