Change handling of rounding errors in accounting

[BerglundDaniel]

Summary by CodeRabbit

• New Features

  • Introduced support for exporting transaction history as SIE files for accounting purposes.

• Improvements

  • Refined the logic for distributing transaction fees among products with different debit accounts or cost centers.
  • Improved handling of rounding errors during transaction fee distribution.

• Bug Fixes

  • Fixed an issue where the absence of product_accounting could cause unexpected behavior by adding necessary checks.

• Tests

  • Updated accounting tests to reflect changes in fee distribution logic and data creation methods.
  • Removed outdated tests related to removed rounding error conversions.

• Documentation

  • Updated README with a summary of new accounting features and improvements.

• Chores

  • Removed unused logging statements and deprecated functions related to rounding error handling in accounting logic.

[coderabbitai[bot]]

Walkthrough

The recent updates focus on enhancing the system's accounting features. Key improvements include the ability to export transaction history as SIE files, refined logic for allocating transaction fees across products based on quantity and total price, and precise handling of rounding errors. The code now uses the Decimal data type for financial calculations to ensure accuracy. Additionally, obsolete functions related to rounding error conversions have been removed, and the test suite has been updated to align with the new logic.

Changes

File Path	Change Summary
README.md	Introduced SIE file export support; refined product price adjustment logic to distribute transaction fees considering quantity and price, with rounding error corrections.
.../accounting/accounting.py	Updated functions for transaction/payment discrepancies, fee distribution, and account splitting; improved accuracy with Decimal and error handling.
.../accounting/export.py	Removed functions and logs related to rounding error transactions.
.../accounting/test/accounting_test.py	Updated tests for new logic in fee splitting and account transactions; added tests for odd fees and fractions; removed pytest import.
.../accounting/test/export_test.py	Removed tests for the now-deleted rounding error transaction function.
.../accounting/verification.py	Minor updates with added whitespace and TODO for future verification tests.

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