Add two (for the moment undocumented) functions:

- commodity_price(NAME, DATE)
- set_commodity_price(NAME, DATE)

Using these two I am able to compute rate of return over a period of
transactions, taking additional deposits and withdrawals into account, using
the following automated transactions:

  P 2019-12-31 12:00:00 ROI $1.00

  2020-01-01 Start of record
      (ROI)  0 ROI

  = expr date >= [2020/01/01] && account =~ /Broker:Cash$/ and any(account =~ /Assets:Checking/)
      (ROI)  (1 ROI * (amount / commodity_price(1 ROI, date)))

  = expr date >= [2020/01/01] && account =~ /:Capital:/
      (ROI)  (set_commodity_price(1 ROI, date, ((commodity_price(1 ROI, date) * account("ROI").amount) - amount) / account("ROI").amount) || 0 ROI)

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