Enhancement - added echo of id, description

- Added an echo of the ID and description of the task for the start,
  stop, do, undo, delete and undelete commands.  Thanks to Bruce
  Dillahunty.
- Updated documentation.
- Added "echo.command=no" to delete.t, undo.t because the default
  value is "yes", which breaks tests.
- Fixed syntax errors in utf8.t
- Corrected expected number of tests in recur.t

src/tests/undo.t

@@ -33,7 +33,8 @@ use Test::More tests => 15;
 # Create the rc file.
 if (open my $fh, '>', 'undo.rc')
 {
-  print $fh "data.location=.\n";
+  print $fh "data.location=.\n",
+            "echo.command=no\n";
   close $fh;
   ok (-r 'undo.rc', 'Created undo.rc');
 }