celery: fix logging from inside tasks Celery will hijack the global logging configuration and disable the usual Kallithea logging (unless CELERYD_HIJACK_ROOT_LOGGER is set False). Fixed partially by using the special celery loggers inside the tasks. Logging from modules will still not work.

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
.