Demonstration of running scenarios from SR1.5 database

[znicholls]

Is your feature request related to a problem? Please describe.

It's not possible to run scenarios directly from the SR1.5 database at the moment. Adding this capability would be very helpful.

Describe the solution you'd like

A notebook which demonstrates how to run data downloaded directly from the SR1.5 database with Pymagicc.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.