passlib uses deprecated crypt module which is deprecated and scheduled
for removal in 3.13. Unfortunately, this module seems to be
unmaintained, so this commit replaces passlib with bcrypt, unfortunately
breaking current passwords
* allow to use one application for multiple repositories
* update tests
* handle None append argument everywhere
* rewrite repository definition logic
* drop optional flags from docs
* support of new schema in systemd units
* add migration docs and ability to migrate tree automatically
* use repostory id instead
* verbose multiarchitectureerror
* object path support for s3 sync
* fix tests after rebase
