Coreutils 9.1 support

[Vresod]

[Zackptg5]

Have a test branch open if you want to test it out. You'll need to change the url to the 9.1-test branch in install.sh

https://github.com/jarun/advcpmv/tree/9.1-test

[Arun]

Please raise the PR.

[Zackptg5]

@jarun Seems to work fine, Raised PR #22

[Arun]

Closed at #22.