Fix imports in cli scripts
catch all header decoding related errors
update cache-code, fixes missing password verification when using cache
update ChangeLog
add rename stubs for group and user backends
add django implementations for renaming users and groups
add parsers for the rename action
implement rename actions
update changelog
update and relax requirements.txt file
remove minor deprecation warnings
add requirements file for python3 (no wsgiref)
depend on python-mimeparse
update changelog
remove useless print statement
add some first python3 specific code for command-line scripts
fix output of 'ls' in python3
create characters for password globally and py3 compatible
document that the rename action might throw UserExists
correct wording