temp stub of btc reconcile, make btc reconcile faster to load
Merge branch 'master' of github.com:um-cseg/chez-betty
Add btc reconcile db mathy stuff.

Currently works by asking how many BTC you sold, and how much USD you got for it.

This is actually not going to work, because of chicken/egg problem
chicken: number of BTC in coinbase
egg: expected_usd = how many USD you got for selling it, times amount of BTC sold / number of BTC in coinbase
number of BTC in coinbase is going to be sold to 0, so when you make this call, you'll get a divide by 0.

I have no good solutions; should probably use the coinbase API to sell Bitcoin, but I have no ways to test this
without just moving all the coins around...