[backend] old kiwi seems to behave different when using command line parameters. Restore old behaviour for that case.
[docu] Update from 10.3 to 12.3 (yes: five years later! :-)

Just changing the example to fit with a more current version which is still available.
[webui] make "add a reviewer" work again (including test cases)
[webui] fix adding roles to existant users (fixes #326)
[webui] fixing maintenance workflow test
[backend] fix help information for bs_admin --parse-build-desc
[backend] export proxy variables for worker download via curl
[webui] seperate each partition into an own line in daemon monitor
[webui] also test removing user roles
[webui] don't write files in texts, but only read
[webui] make sure we wait for the users to be saved
[webui] allow old links from factory reminder mails
[backend] Extend KiwiXML with missing attributes/elements