Carbon tax calculations

[JesperWe]

• [x] Add UI in the menu column to either specify a $/ ton of CO2
• [x] Same input field has a pulldown with predfined values (from DB table) with a name and number.
• [x] If $/per ton is specified replace the numbers highlighted below with dollars
• [x] Add button in UI to switch between displaying $ or CO2 tons
• [x] Change from Mega to Giga if cost is above 9999 (currency)
• [x] New db table with time series (source, price, currency, year)
• [x] Add co2 cost to Historical and projected CO2E emissions graph

Unit (always millions). Steps:

1. Divide 10^6
2. Make to precision 3
3. 1000 separators (important) https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat

[JesperWe]