Add a notebook example showing how to work with scenarios in the current form

[ryan-kipawa]

• How to list available scenarios and check active scenario
• How to filter queries by a specific scenario (default use active?)
• How to modify the right scenario when updating or inserting values (default use active?)
• How to change the active scenario

[wuwwen]

This is not just a notebook task. We need to implement relative methods in the package.

[ryan-kipawa]

This is not just a notebook task. We need to implement relative methods in the package.

Ok thanks for clarifying that. I've opened a new issue to focus on identifying and implementing those methods #55