not all globstrings are supported in open_files

[ghislainp]

open_files is insensitive to some globstring:

fspec.open_files("filename*.txt") --> it's working fine.
fspec.open_files("filename?.txt") --> it's not working.
fspec.open_files("filename[0-9].txt") --> it's not working.

I'd expect all these globstrings to be expanded, as documented in the glob method.

The reason seems to be in get_fs_token_paths:

if isinstance(paths, (list, tuple, set)):
    paths = expand_paths_if_needed(paths, mode, num, fs, name_function)
else:
    if "w" in mode and expand:
        paths = _expand_paths(paths, name_function, num)
    elif "*" in paths:                                                   <------- HERE. Are more tests needed for "?" and "["  ?
        paths = [f for f in sorted(fs.glob(paths)) if not fs.isdir(f)]
    else:
        paths = [paths]

[martindurant]

You are right, that line could probably use a glob.has_magic function call checking for all the characters that imply glob expansion should happen.

[martindurant]

(please feel free to make a PR with this change)