[#5] Expand egroups migration script to cover egroup system change ourselves

Python/egroup-to-channel.Python/README.md

Python/egroup-to-channel.Python/api_library/__init__.py

Python/egroup-to-channel.Python/api_library/channel.py

.../egroup-to-channel.Python/api_library/egroup_from_ldap.py

Python/egroup-to-channel.Python/api_library/egroups_api.py

Python/egroup-to-channel.Python/api_library/get_api_token.py

Python/egroup-to-channel.Python/api_library/grappa_api.py

...oup-to-channel.Python/api_library/grappa_get_api_token.py

Python/egroup-to-channel.Python/egroup_to_channel.py