[feature] Refactor Reinhart sky discretization
Summary
Refactor to improve time efficiency.
Current behavior
I used pandas concat method in a loop, which is notoriously unefficient ...
Desired behavior
In the for loop : append dictionaries to a list, then after the loop, convert the list of dictionaries into a pandas dataframe. It reduces computing time by a factor of 10 on my computer.
Sources
https://stackoverflow.com/a/36489724