New in v0.9:

- Complies to v1.0 spec
- Reads old par files as well (v0.2 spec, v0.9 spec)

New in v0.5:

- More error checking, deletes failed output files
- New command (par mix):
    Read all parity archives in the current directory, and
    combine all of them to try to recover as many files as possible.

New in v0.4:

- Complies to v0.9 file spec.
- Control hash implemented.
- The ability to not include certain files in the .pxx files (+i flag)