Coin supply and subsidy about dcrdata

[raedah]

Coin supply over time would be good on a chart. Could break it down further even to PoW mined, PoS mined. Also, ticket pool size over time, in tickets, price, and tickets * price.

[chappjc]

Coin supply breakdown is a good idea. Not too hard either.

We already have pool info, in the denominations mentioned, but I'd have to check.

[raedah]

On the front end to start we could use the chart plotter we used on dcrstakesim to display block and pool data. Dave is a fan of it because its the only one known that can handle large data sets.
https://github.com/davecgh/dcrstakesim/blob/master/resultstemplate.go

[chappjc]

@gozart1 have you seen the above plotting tools? I wonder if they would work well on the stats page too

[gozart1]

I have a local branch in dcrdata-web that computes supply and reward on client side, and renders them in a 2 line chart from block 0 to 1337000. I'll push it up this evening and post here. But api would be nice as it would improve unix time accuracy of the historical data.

[chappjc]

Need to add a column the database for coin supply. Might be good to add number of voters, or perhaps a new table for vote info.

[chappjc]

Subsidy addressed by #592, supply addressed by #458