Bugfix: can't use Python API

Describe the bug

Importing the python API fails: ImportError: cannot import name 'update' from partially initialized module 'archivebox.main' (most likely due to a circular import)

Steps to reproduce

1. pip install archivebox
2. python -c "from archivebox.main import add"

Screenshots or log output

Python 3.8.5 (default, Aug 12 2020, 00:00:00) 
[GCC 10.2.1 20200723 (Red Hat 10.2.1-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from archivebox.main import add, remove, info, config
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/user/projects/news/ArchiveBox/archivebox/main.py", line 10, in <module>
    from .cli import (
  File "/home/user/projects/news/ArchiveBox/archivebox/cli/__init__.py", line 65, in <module>
    SUBCOMMANDS = list_subcommands()
  File "/home/user/projects/news/ArchiveBox/archivebox/cli/__init__.py", line 41, in list_subcommands
    module = import_module('.archivebox_{}'.format(subcommand), __package__)
  File "/home/user/.virtualenvs/archivebox/lib64/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/home/user/projects/news/ArchiveBox/archivebox/cli/archivebox_update.py", line 11, in <module>
    from ..main import update
ImportError: cannot import name 'update' from partially initialized module 'archivebox.main' (most likely due to a circular import) (/home/user/projects/news/ArchiveBox/archivebox/main.py)

Software versions

• OS: fedora-32
• ArchiveBox version: v0.4.21 (from pip: c1f2188 I suppose)
• Python version: 3.8.5
• Chrome version: (not relevant)

Additional Notes

Seems to be similar to https://github.com/pirate/ArchiveBox/issues/372

[pirate]

I believe all the issues reported here have been fixed at this point e92db03, but feel free to comment back here if you’re still having problems and I’ll open the ticket.

>>> from archivebox.config import setup_django
>>> setup_django()
...
>>> from main import init
>>> init()
...
>>> from core.models import Snapshot
>>> Snapshot.objects.all()
<QuerySet []>

[pirate]

We don’t currently support running it from another directory other than the data dir, the os.chdir(DATA_DIR) call (before setup_django()) is mandatory for now. This restriction will likely be lifted in a future version once archivebox oneshot is released.