Add support for ledger lot dates and notes to bean-report

[blais]

Original report by Marin Bernard (Bitbucket: marinbernard, GitHub: marinbernard).

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While bean-report supports the conversion of beancount lot expressions to ledger syntax, it currently discards lot dates and notes. The following transaction:

2020-01-01 open Assets:Bank
2020-01-01 open Expenses:Computers
2020-01-01 commodity COMPUTER
    format: "1, COMPUTER"

2020-01-01 commodity USD

option "operating_currency" "USD"

2020-02-01 * "Super Shop"  "New computer"
    Expenses:Computers       1 COMPUTER {900.00 USD, 2019-12-25, "DiscountedComputer"} @ 1100.00 USD
    Assets:Bank

Is currently rendered as:

account Assets:Bank                                    

account Expenses:Computers                             

commodity COMPUTER

commodity USD

2020-02-01 * Super Shop | New computer
  Expenses:Computers                    1 COMPUTER {900.00 USD} @ 1100.00 USD
  Assets:Bank                                      -900.00 USD

Since ledger also supports lot dates/notes, bean-report should ideally include them in the output, like:

account Assets:Bank                                    

account Expenses:Computers                             

commodity COMPUTER

commodity USD

2020-01-01 * Super Shop | New computer
    Expenses:Computers  1 COMPUTER [2019-12-25] {900.00 USD} (ChristmasDiscountedComputer) @ 1100.00 USD
    Assets:Bank

This would actually make bean-report usable as a converter for complex journals full of lot annotations.

[blais]

Original comment by Martin Michlmayr (Bitbucket: tbm13, GitHub: tbm).

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I have some pending fixes for ledger output that I have to clean up and submit.

I can probably fix this one as well.

‌

[blais]

@tbm That's one for you if you want.
I will likely remove the converters in the next version or fork them to a separate repo for other people to work on.

[tbm]

Can you move this ticket to https://github.com/beancount/beancount2ledger

There should be a link "Transfer issue" in the lower right corner (there's an arrow to the right).

[tbm]

@MarinBernard I split out the ledger conversion from beancount into a standalone tool called beancount2ledger. Please give this a go.