dar-backup v2 now in a quite usable state

All,

I have been working on a python based wrapper of `dar` to replace the first version built in bash.

Features:
  - Utilize `dar` for the heavy lifting.
  - Run `dar -t` and perform restore verification of random files.
  - Build Parchive (Par2) redundancy files to increase likelihood of fixing bitrot.
  - Handle archive catalogs when backing up and cleaning out old archives.

If interested, take a look here: https://github.com/per2jensen/dar-backup/tree/main/v2


Thanks to Denis for his commitment to maintain `dar` over decades. `dar` has saved me from problems more than once :-)


Best regards
Per