Add simple bookkeeping capabilities to calculator

Would like to use the calculator as a general-purpose personal finance tracking, that would make the Keyphone a an exceptional tool

Adding a screen where we could enter a amount, date, and description, it should memorize it, and we should be able to see an accumulating total, ability to handle multiple lists (accounts)

Few pluses below
would be to be able to see a page with sum of all lists, Current Balance Sheet

Page to enter date from and date to and see gain and loss for each list.

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