Enhancement - undo

- Removed obsolete undelete command.
- Removed obsolete undo command.
- Implemented new undo command as a call to the stubbed TDB::undo call.

src/Context.cpp

@@ -200,9 +200,7 @@ std::string Context::dispatch ()
   else if (cmd.command == "append")        { out = handleAppend          (); }
   else if (cmd.command == "annotate")      { out = handleAnnotate        (); }
   else if (cmd.command == "done")          { out = handleDone            (); }
-  else if (cmd.command == "undo")          { out = handleUndo            (); }
   else if (cmd.command == "delete")        { out = handleDelete          (); }
-  else if (cmd.command == "undelete")      { out = handleUndelete        (); }
   else if (cmd.command == "start")         { out = handleStart           (); }
   else if (cmd.command == "stop")          { out = handleStop            (); }
   else if (cmd.command == "export")        { out = handleExport          (); }
@@ -212,6 +210,7 @@ std::string Context::dispatch ()
 #ifdef FEATURE_SHELL
   else if (cmd.command == "shell")         {       handleShell           (); }
 #endif
+  else if (cmd.command == "undo")          {       handleUndo            (); }
   else if (cmd.command == "" &&
            sequence.size ())               { out = handleModify          (); }