Piecash

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- fix changes from yahoo API (fix user-agent to "", remove recovery of crumble)
- fix tzlocal>=2.3 issue with change of tz type returned by tzlocal.get_localzone() (fix 180 185)
- move to github actions
- remove contrib.napoleon as included in sphinx as of 1.3
- change pytest.yield_fixture to pytest.fixture
- remove unused code

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- fix issue when deleting splits (fix 155)
- reformat files with black

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- add `at_date` parameter to `Account.get_balance` (tx rvijayc, gregwalters)

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- fix ledger export truncation of prices (fix 158)
- fix ledger export to order transactions by date (fix 159)

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- allow tags with zero quantity by fixing unit price calculation (fix 153, tx croth1)
- allow tags with zero quantity of value by fixing validation control (fix 154, tx stoklund)
- use template0 when creating new books in postgres (vs template1 before) to fix encoding issues
- add examples for deleting an account and exporting transactions to a CSV file

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- requires sqlalchemy < 1.4 (fix 149)
- fix example with wrong post_date type
- update currency_ISO
- update use of deprecated function in xml (fix 147, tx bxbrenden)
- add example of program to modify an existing transaction