Feedback: Add Settlement period

[peterdudfield]

Idea is to put Settlement period on the UI

Suggestion from MW: it could be in the hover box on the graph

Settlement Periods
What are Settlement Periods?
Electricity is traded in half hour ‘chunks’. These half hour chunks are referred to as Settlement Periods. Each day (Settlement Day) is split into 48 Settlement Periods, with Settlement Period 1 equivalent to 00:00 to 00:30, Settlement Period 2 to 00:30 to 01:00, Settlement Period 3 to 01:00 to 01:30 and so on, through to Settlement Period 47 (23:00 to 23:30) and Settlement Period 48 (23 :30 to 00:00). Settlement Periods always refer to local time (whether this is GMT or BST).
Each Settlement Period is settled in isolation from the Settlement Periods around it. This means that all information used in the settlement calculations must be at Settlement Period level which includes metered data, contract data, and physical data.