temporarily extract compressed archive files (.tar.gz, .tar.xz, etc.)

[jtmoon79]

Summary

With #284 it is now pretty easy to extract a compressed file to a temporary file. So automatically handle compressed archive files, e.g. logs.tar.gz, etc.

Current behavior

Given a gzipped tar file dtf2-2_dtf3-1.tar.gz

$ s4 /tmp/dtf2-2_dtf3-1.tar.gz
ERROR: other error: failed to read entire block for file "/tmp/dtf2-2_dtf3-1.tar.gz"

Using s4 0.7.72

Suggested behavior

1. for some file that is file.tar.ZZ where .ZZ is some compression name, .gz, .xz etc.
2. extract file.tar to a temporary directory
3. process file.tar using function process_tar

Setting the file path for display in -p and --summary will require some minor refactoring.