Prepare structure for parsing extractable data (parser, reader, writer).
The model is argparse.
Extension of the Reader interface.
Problems with the file_operation returning NoneType:
tests failing.
Change interface to whole files (read+write).
tests ok for reading
Structure refactored
various fixes.
tests for writing defined
writing definitions tried (failed).
tests for writing defined
writing definitions tried (failed).
writers rewritten
tests passed.
parser implemented. Bare-ass tests.