Enhancement - TDB API cleanup

- Removed obsolete TDB::deleteT method.
- Removed obsolete TDB::completeT method.
- Updated documentation.

html/task.html

@@ -127,6 +127,7 @@
                       and also have modifications applied (thanks to David J Patrick).
                   <li>The "append", and "done" commands now allow modifications to be applied
                       to the task(s) (thanks to David J Patrick).
+                  <li>Improved word wrapping in various output.
                 </ul>
 
                 <p>