Obiba-opal

Fix for 33 and security update 35

pycurl` dependency replaced by `requests` and `urllib3`.

Fix for 28

* Python API refactored to be reusable. See documentation at: https://opaldoc.obiba.org/en/latest/python-user-guide/api.html
* TOTP is automatically requested when needed

Fix for 25

First publication on pypi.org:

https://pypi.org/project/obiba-opal/