Commands - ids, _ids, _zshids

- Migrated handleIds, handleCompletionIds, handleZshCompletionIds
  to CmdIDs.

src/commands/CmdHelp.cpp

@@ -236,10 +236,6 @@ int CmdHelp::execute (const std::string& command_line, std::string& output)
   view.set (row, 1, "task count [filter]");
   view.set (row, 2, "Shows only the number of matching tasks.");
 
-  row = view.addRow ();
-  view.set (row, 1, "task ids [filter]");
-  view.set (row, 2, "Shows only the IDs of matching tasks, in the form of a range.");
-
   row = view.addRow ();
   view.set (row, 1, "task config [name [value | '']]");
   view.set (row, 2, "Add, modify and remove settings in the task configuration.");