* Needed to correctly support UTF-8 ReadableSTR decoding on Py3

* Introduced in 5f2e50a0
* Caused the POST payload to be always ignored, breaking the function completely.
* Great job finding and debugging this, Honza Žerdík.

Fixes wrong references in embedded (dict in dict) class variables
outside the class variable definition context, for redefined
inherited class variables.

Aimed mainly at web method invocation (similar to warden_curl_test.sh
from warden_client) and some command line interface commands.

Shuffle directories and filenames to get rid of historic cruft and to better reflect contrib/production status