- woops TDStackFrameNodeBuilder should be obsolete and TDStackFrameContentsClientListElementBuilder should not
- TDAbstractDevTool class>>performCommand:objIn:commandOptions:todeCommand:  to provide for --help for regular commands
- --help option added to abort, cat and cd commands ... tests
- categorize some TDShellTool methods ... those that have been rewriiten
- begin work on the `cls` command ...
- `cls accessors` implemented plus tests
- fix an option handling error in `bu` command