Unit Tests

- Removed mention of synch.key from all unit tests.  This is an obsolete file.

test/bug.sort.t

@@ -51,12 +51,11 @@ $output = qx{../src/task rc:bug_sort.rc list 2>&1};
 like ($output, qr/three.*one.*two/msi, 'list did not hang after pri:H on 1');
 
 # Cleanup.
-unlink qw(pending.data completed.data undo.data backlog.data synch.key bug_sort.rc);
+unlink qw(pending.data completed.data undo.data backlog.data bug_sort.rc);
 ok (! -r 'pending.data'   &&
     ! -r 'completed.data' &&
     ! -r 'undo.data'      &&
     ! -r 'backlog.data'   &&
-    ! -r 'synch.key'      &&
     ! -r 'bug_sort.rc', 'Cleanup');
 
 exit 0;