pkgconflict doesn't work with pkgfile 22

[ilpianista]

First, the shebang have to be fixed to point to python2, then if you try to use it, you get:

$ pkgconflict /var/cache/pacman/pkg/aspell-0.60.6-5-x86_64.pkg.tar.xz
Traceback (most recent call last):
File "/usr/bin/pkgconflict", line 89, in
known_files = read_file_lists(FILELIST_DIR)
File "/usr/bin/pkgconflict", line 59, in read_file_lists
packages = os.listdir(repopath)
OSError: [Errno 20] Not a directory: '/var/cache/pkgtools/lists/local.files.tar.gz

[mineo]

These issues are easy to fix (the second one just needs a if not repo.endswith("tar.gz") so the .tar.gz files in /var/cache/pkgtools/lists are ignored). The bigger problem is that the tarfile module does not support xz compression so we can't even get the file list from sys.argv[1].