Rename Score to Severity

[csala]

Currently, the analyze method returns a column called score, which indicates the severity of the anomaly.
This name is also in the Database Schema, currently as part a field of the Events class, possible elsewhere after #66 .

The problem with this name is that it can be confused with a goodness-of-fit score, such as accuracy or f1, so I want to propose changing it severity everywhere.

[csala]

Any thoughts @dyuliu @AlexanderGeiger ?

[AlexanderGeiger]

@csala I agree, it's a good idea to rename it to severity