Support for network drives or filesystems that don't implement FSYNC

#### Describe the bug
The issue encountered occurs when attempting to initialize an archivebox directory on a mounted network drive. The issue is reproducible in multiple directory locations located on the NAS. Initializing an archivebox directory on the local drive of the machine succeed. Additionally, if a successfully initialized directory is copied to the NAS, future archivebox operations on that copied directory fail. The write of the Config file appears to fail based on the traceback.

I investigated the trace output and added print statements to the atomicwrites function in which the failure occurs at line 46 of atomicwrites __init__.py
Additionally, I uncommented the print statement at line 41 of archivebox system.py for further debug info.

#### Steps to reproduce
`mkdir archivebox; cd archivebox; archivebox init`


#### Screenshots or log output
OUTPUT:
```bash
$ archivebox init
[i] [2020-08-20 19:55:28] ArchiveBox v0.4.21: archivebox init
     /Volumes/Public/data/archivebox

[+] Initializing a new ArchiveBox collection in this folder...
    /Volumes/Public/data/archivebox
------------------------------------------------------------------

[+] Building archive folder structure...
    √ /Volumes/Public/data/archivebox/sources
    √ /Volumes/Public/data/archivebox/archive
    √ /Volumes/Public/data/archivebox/logs

 Atomic Write: w /Volumes/Public/data/archivebox/ArchiveBox.conf 437 overwrite=True
fd is: 3
fcntl.F_FULLFSYNC is 51
fd is: 3
fcntl.F_FULLFSYNC is 51
Traceback (most recent call last):
  File "/Users/user123/.pyenv/versions/3.8.5/bin/archivebox", line 8, in <module>
    sys.exit(main())
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/archivebox/cli/__init__.py", line 122, in main
    run_subcommand(
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/archivebox/cli/__init__.py", line 62, in run_subcommand
    module.main(args=subcommand_args, stdin=stdin, pwd=pwd)    # type: ignore
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/archivebox/cli/archivebox_init.py", line 33, in main
    init(
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/archivebox/util.py", line 111, in typechecked_function
    return func(*args, **kwargs)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/archivebox/main.py", line 294, in init
    write_config_file({}, out_dir=out_dir)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/archivebox/config/__init__.py", line 376, in write_config_file
    atomic_write(config_path, CONFIG_HEADER)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/archivebox/util.py", line 111, in typechecked_function
    return func(*args, **kwargs)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/archivebox/system.py", line 46, in atomic_write
    f.write(contents)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/contextlib.py", line 120, in __exit__
    next(self.gen)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/atomicwrites/__init__.py", line 171, in _open
    self.commit(f)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/atomicwrites/__init__.py", line 204, in commit
    replace_atomic(f.name, self._path)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/atomicwrites/__init__.py", line 101, in replace_atomic
    return _replace_atomic(src, dst)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/atomicwrites/__init__.py", line 58, in _replace_atomic
    _sync_directory(os.path.normpath(os.path.dirname(dst)))
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/atomicwrites/__init__.py", line 52, in _sync_directory
    _proper_fsync(fd)
  File "/Users/user123/.pyenv/versions/3.8.5/lib/python3.8/site-packages/atomicwrites/__init__.py", line 46, in _proper_fsync
    fcntl.fcntl(fd, fcntl.F_FULLFSYNC)
FileNotFoundError: [Errno 2] No such file or directory
```

Here is the output of mount for the two disks: 
SUCCESS DRIVE:
`/dev/disk1s5 on /System/Volumes/Data (apfs, local, journaled, nobrowse)`
FAIL DRIVE: 
`//;AUTH=No%20User%20Authent@Drobo-5N2-RYE._afpovertcp._tcp.local/Public on /Volumes/Public (afpfs, nodev, nosuid, mounted by user123)`

Here are the file permissions of the FAIL directory
`drwxrwxrwx  1 user123  staff          264 Aug 20 15:55 archivebox`



#### Software versions

 - OS:    MacOS 10.15.6 (19G73)                   
 - ArchiveBox version:    ArchiveBox v0.4.21    
 - Python version:         Python 3.8.5



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Support for network drives or filesystems that don't implement FSYNC #456

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Support for network drives or filesystems that don't implement FSYNC #456

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