color.due.today and color.calendar.due.today

- tasks due on the current day ("today") can now be colorized with
  their own color.
- this is for reports and the calendar

src/tests/color.due.t

@@ -41,7 +41,7 @@ if (open my $fh, '>', 'color.rc')
 }
 
 # Test the add command.
-qx{../task rc:color.rc add due:eoy nothing};
+qx{../task rc:color.rc add due:12/31/2037 nothing};
 qx{../task rc:color.rc add due:tomorrow red};
 my $output = qx{../task rc:color.rc list};