Commands - calendar

- Migrated handleReportCalendar to CmdCalendar.

src/commands/CmdHelp.cpp

@@ -119,10 +119,6 @@ int CmdHelp::execute (const std::string&, std::string& output)
   view.set (row, 1, "task timesheet [weeks]");
   view.set (row, 2, "Shows a weekly report of tasks completed and started.");
 
-  row = view.addRow ();
-  view.set (row, 1, "task calendar [due|month year|year]");
-  view.set (row, 2, "Shows a calendar, with due tasks marked.");
-
   row = view.addRow ();
   view.set (row, 1, "task merge URL");
   view.set (row, 2, "Merges the specified undo.data file with the local data files.");