Compression level options for bzip3 is invalid

Currently, Options for bzip3 are as follows:

https://github.com/wummel/patool/blob/db5edf0e001d069a36cce29ed9a7915fa13d2013/patoolib/programs/bzip3.py#L28

The usage at bzip3 1.3.2 is as follows:

bzip3 - better and stronger spiritual successor to bzip2.
Usage: bzip3 [-e/-z/-d/-t/-c/-h/-V] [-b block_size] [-j jobs] files...
Operations:
  -e/-z, --encode   compress data (default)
  -d, --decode      decompress data
  -r, --recover     attempt at recovering corrupted data
  -t, --test        verify validity of compressed data
  -h, --help        display an usage overview
  -f, --force       force overwriting output if it already exists
  -k, --keep        keep (don't delete) input files (default)
  -v, --verbose     verbose mode (display more information)
  -V, --version     display version information
Extra flags:
  -c, --stdout      force writing to standard output
  -b N, --block=N   set block size in MiB {16}
  -B, --batch       process all files specified as inputs
  -j N, --jobs=N    set the amount of parallel threads

Report bugs to: https://github.com/kspalaiologos/bzip3

In other words, bzip3 does not have options like -9 or --fast like gzip.^1 According to the author, this is intentional.^2

Therefore, I think -9 should be removed.

wummel / patool

Compression level options for bzip3 is invalid #134