GitLab

- use autopep8 & black
- declare names in the public API using __all__ attribute
- fix a typo: AccDocXMLWriterTest instead of AccDocXMLWriterGenericTest

- fix _run_pdf_test function
- add reference pdfs for Reportlab version 3.5.42

because round(11.145, 2) returns 11.14, let's fix:
- test_add_credit_movement_when_rounding
- test_add_debit_movement_when_rounding

- update generator, xmlwriter & accdoc modules to make sure we pass correct str instead of bytes
- update some tests to make sure we compare unicode strings

- AssertionError: dict_keys(['default']) != ['default']
- AssertionError: dict_keys(['non-existing-default']) != ['non-existing-default']

- import reduce from functools module
- use generators instead of lists whenever possible

- Fix AttributeError: 'dict_keys' object has no attribute 'sort'
- Fix AttributeError: 'dict' object has no attribute 'has_key'

- move files to package folder
- update MANIFEST.in, setup.py & __pkginfo__.py
- fix Reportlab version to 3.5.42
- fix copyright date
- use unittest from std lib

Raises a PyBillProcessingException instead of a PyBillWritingException. WritingException is used when writing data in files