- Added a visited_entities parameter to save all Entities already treated in to_xml. New calls to to_xml are checked against this to identify potential infinite recursion
- Added test
- Updated changelog

TST: Added support for logout to MockUpServerConnection and tests to fix test_auth_token_connection in test_connection.py

- Remove check_wrapped and match_entity
 - adjust behaviour to fit documentation
 - small restructuring of docstring
 - change tests to reflect new behaviour

This reverts commit 2727ff2e.

This reverts merge request !137