Add "portion of max supply" calculation

[vsubhuman]

Calculation result panel should show delta of the max-supply portion that user got in the selected year.

For example:

1. My stake is 1'000'000 ADA
2. My stake is 0.002222% of mux-supply (45 bil)
3. In the first year I got (for example) - 30K ADA
4. My stake is now 1'030'000
5. My stake is now 0.002288% of max-supply
6. The delta is 0.000066% of max-supply

Debatable

[vsubhuman]

Re-planned for the next version