Fixes and improvements to the ltfs_ordered_copy tool

[asivery]

Summary of changes

This pull request includes following changes or fixes:

• Fix the ltfs_ordered_copy tool crashing due to comparing bytes with str.
• Add optional dependency on tqdm for nicer progress bars.

Description

The first fix was required for me to even use this tool under modern python and pyxattr.

I believe a better progress bar might be more useful when copying smaller amounts of larger files - as of right now, this utility only shows the number of the file that's being copied.

I also believe it might be worth documenting somewhere, that sometimes it's absolutely crucial to use this tool instead of the system-avaliable cp or rsync. Without it, my drive (SAS IBM LTO7-HH) kept thrashing and throwing IO errors. Also, since python2 reached EOL six years ago, I think it might be worth removing mentions of it from the README.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have confirmed my fix is effective or that my feature works

[asivery]

I've increased the buffer size to 256MiB, since with a lower values, such as the ones defined in the shutil package, sometimes the streamer can run out of data and stall, then rewind. In worst cases it would even partially unload the tape. After increasing the buffer size, these incidents have seemingly stopped.

[hugo-hur]

Could you please also add move functionality with a flag. I don't recall such feature in the old versions. Would be nice for moving directories from tape to another storage. EDIT: Nevermind I made another pr for that.

[XV02]

Thanks for your work, it looks great, just one comment

[XV02]

LGTM! Thanks for all your work and quick resolution of requests

[vandelvan]

Thank you for your contribution! LGTM