- Make ReturnBounds parameter configurable
- Make possible to read history recursively

Co-authored-by: oroulet <olivier@r-dt.net>

* write_values & read_values

* arguments are included

* add service result code to log

* add diagnostics to log output
Co-authored-by: Randolph Busch <randolph.busch@ticos.ch>

* Added sync functions for SyncNode.add_variable_type() and SyncNode.add_reference()

* Added sync function client.get_namespace_array()

* Added sync function server.export_xml_by_ns().
This has to be reviewed. In my example case the export is not working because of several errors. One of them being TypeError: must be called with a dataclass type or instance

* Removed export_xml_by_ns() from SyncServer.

Co-authored-by: Henrik Viebrock <henrik.viebrock@☺fh-bielefeld.de>

* init

* Update internal_server.py

* cleanup

* Update internal_server.py

* Update server.py

* add test

* Update test_server.py

This reverts commit 0a1cce07.

#461 causes connection problems. See #520