iPyHooks.py - minor changes
[DirTools|clean] addes DirTools module, and `clean` command

(cherry picked from commit 390ec8802578a1da062af82949096a7cb99dc535)
(cherry picked from commit f4c8a55bc7213f4d04f3e8203596dd98d0b8b021)
[Directory-TreeWalking] new notebook
[Various-ConvertingKeyChains] New Notebook