Unit Tests - confirmation, delete, subst, undo

- Modified unit tests to accommodate changes in the verbose output
  of task.
- Added tests to verify /delete-me// substitutions.
- Fixed typos in test descriptions.

src/tests/delete.t

@@ -57,7 +57,7 @@ like ($output, qr/^No matches/, 'No matches');
 ok (-r 'completed.data', 'completed.data created');
 
 $output = qx{../task rc:undelete.rc undelete 1};
-like ($output, qr/reliably undeleted/, 'can only be reliable undeleted...');
+like ($output, qr/Task 1 not found/, 'Task 1 not found');
 
 $output = qx{../task rc:undelete.rc info 1};
 like ($output, qr/No matches./, 'no matches');